This genuine-style air conditioning pipe is designed as a direct-fit replacement for a range of Peugeot and Citroën models. Ideal for professional workshops and experienced DIY technicians, the pipe restores proper refrigerant routing and system integrity after damage or degradation. Frequently searched by OE numbers, this part provides a reliable repair option when the original line is cracked, corroded or leaking at connections. Using the correct replacement pipe helps maintain system pressure, reduces risk of compressor damage and ensures efficient cabin cooling.

Technical Information

• Manufacturer: Stellantis (Peugeot / Citroën)
• Model: Peugeot 308, 3008, 5008, RCZ; Citroën C4, C4 II, C4 Picasso
• Product Codes: 9684755680, 6477H8
• Other Numbers: Commonly referenced under OE numbers 9684755680 / 6477H8

Installation Recommendations

Replacement of an air conditioning pipe should be performed by a qualified technician or an experienced DIYer with the correct tools. Recommended steps:

1. Recover Refrigerant: Evacuate and recover refrigerant using approved recovery equipment in accordance with local regulations.
2. Depressurize System: Ensure the system is fully depressurized before opening any fittings.
3. Access And Remove: Gain access to the faulty pipe (may require removal of engine covers, intake components or battery depending on model). Loosen and remove fittings at both ends, retaining any reusable brackets if undamaged.
4. Replace Seals: Always replace O-rings/seals at each connection with new, correct-size refrigerant-rated O-rings lubricated with the correct PAG oil type.
5. Install Pipe: Fit new pipe and torque fittings to manufacturer specification to avoid leaks or deformation.
6. Vacuum And Recharge: Evacuate system to required vacuum level, perform leak check, then recharge with the correct refrigerant type and oil quantity per vehicle specification.
7. Functional Test: Run the A/C system, check pressures and verify cooling performance and leak-free operation.

Always follow manufacturer safety procedures. Wear protective gloves and eye protection when working with refrigerant and pressurized systems.

Why This Part Most Often Fails

Air conditioning pipes commonly fail due to a combination of factors: corrosion from road salts or moisture on metal sections, mechanical damage from impacts or debris, and seal/O-ring deterioration at connection points. Vibration and thermal cycling over years can lead to fatigue at bends or joints. In vehicles exposed to harsh climates or where the pipe routing is close to moving components, the risk of chafing or puncture increases. When a leak develops, the system loses refrigerant and oil, which can quickly lead to compressor overheating and reduced cooling performance.

Practical Notes

OE Part Numbers Are Often Used By Technicians When Searching For This Component. When replacing, ensure you fit new O-rings and follow correct evacuation/recharge procedures to protect the rest of the A/C system. This pipe is commonly fitted across several Peugeot and Citroën models listed above and is a standard repair item in cooling, heating and air conditioning maintenance.

Description

This replacement air blower fan (blower motor) is designed for Citroën C8 and Peugeot 807 vehicles equipped with automatic climate control. The unit corresponds to OEM references 1485728080 and 6441T9 and is commonly searched by these part numbers. It delivers reliable airflow for heating, ventilation and air conditioning (HVAC) systems, restoring proper cabin climate control and ensuring comfortable operation of automatic A/C systems.

Key Features

• Direct fit for Citroën C8 and Peugeot 807 with automatic climate control.
• Matches OEM part numbers 1485728080 and 6441T9 for easy identification.
• Designed to provide consistent airflow across all fan speeds.
• Robust construction to withstand typical HVAC operating conditions.

Technical Information

• Manufacturer: Stellantis / Citroën / Peugeot
• Model: Citroën C8, Peugeot 807
• Product Codes: 1485728080, 6441T9
• Additional Numbers: OEM Reference 1485728080; Internal Code 6441T9

Installation Recommendation

Installation should be performed by a trained mechanic or an experienced DIYer with basic vehicle electrical knowledge. Typical replacement steps:

• Disconnect the vehicle battery before starting to avoid electrical short circuits.
• Access the blower motor—usually located under the passenger-side dashboard behind the glovebox. Remove the glovebox and lower trim panels as required.
• Unplug the electrical connector and detach any wiring harness clips.
• Remove the mounting screws/bolts securing the blower housing and extract the old unit. Note the position of the blower resistor or electronic speed controller if located separately.
• Fit the new blower motor, secure with fasteners, reconnect the electrical connector and reassemble trims.
• Reconnect the battery and verify operation across all fan speeds and automatic A/C modes. Check for unusual noises or vibrations.

Why The Part Most Commonly Fails

Blower motors typically fail due to worn brushes and bearings after prolonged use, accumulation of dust and debris inside the wheel, water ingress from leaks, or overheating driven by a clogged cabin filter or failing blower resistor. Symptoms include reduced airflow, noises (rattling, grinding or squealing), intermittent operation or the fan working only on certain speeds. Replacing the blower motor and inspecting the cabin filter and resistor assembly will often resolve these issues.

Practical Tips

• Always inspect and, if necessary, replace the cabin pollen filter when replacing the blower motor to prevent premature wear caused by restricted airflow.
• Check the blower wheel for debris (leaves, dust) and clean the housing before fitting the new motor.
• Verify the condition of the blower resistor or electronic speed controller and replace if faulty.
• Listen for unusual noises during the first test run—early detection prevents repeated removal.

Compatibility And Identification

Search by OEM numbers 1485728080 or 6441T9 to find this exact unit for Citroën C8 and Peugeot 807 models. These part numbers are commonly used by workshops and DIYers to ensure correct replacement.

High-quality Denso heater servo motor designed for Citroën C8 and Peugeot 807 HVAC systems. This replacement actuator restores accurate control of airflow and temperature blend doors, eliminating common symptoms such as stuck temperature settings, lack of warm/cold air switching, or audible clicking from the dashboard. Ideal for professional workshops and skilled DIY mechanics searching by part number (EAM590, 6447LW) or by vehicle model.

Key Benefits

– Direct fit for the original mounting and electrical connector to simplify installation.
– Improves cabin comfort by reliably positioning blend/airflow flaps.
– Manufactured by Denso components to factory-level quality standards.

Typical Symptoms Indicating Replacement

• Clicking or grinding noises behind the dashboard when changing temperature or vent mode.
• Inability to change cabin temperature or vent direction despite controls being moved.
• Intermittent heating/cooling operation or inconsistent airflow from vents.

Installation Recommendations

• Disconnect the battery before starting work to avoid short circuits and protect vehicle electronics.
• Access the actuator from under the glovebox or lower dash panel depending on the vehicle — remove trim panels and securing screws carefully.
• Unplug the electrical connector and remove retaining screws fixing the servo to the HVAC housing.
• Fit the replacement unit in the correct orientation, secure all fasteners, and reconnect the electrical plug.
• After installation, cycle the HVAC controls several times (full cold to full hot and vent positions) to allow the actuator to find end stops and self-calibrate; some vehicles may perform an automatic initialization routine.
• Observe manufacturer instructions for panel removal and reassembly to avoid breaking plastic clips or connectors.

Why This Part Commonly Fails

• Plastic Gear Wear: Internal plastic gears can wear or strip over time, causing loss of motion or noisy operation.
• Motor Burnout: Continuous stalling or overheating may damage the small electric motor inside the actuator.
• Moisture And Contaminants: Water ingress or debris in the HVAC box accelerates mechanical wear and may short internal electronics.
• Age And Usage: Repeated cycles and age-related fatigue make actuators one of the more common failure items in HVAC systems.

Technical Information

• Manufacturer: Denso
• Model: Citroën C8; Peugeot 807
• Product Codes: EAM590, 6447LW
• Additional Numbers: 6447LW

Practical Tips For Workshops And DIY Mechanics

Keep replacement screws and clips organized during disassembly. Inspect adjacent HVAC components (linkages, flaps, and foam seals) for damage while the unit is accessible. If the actuator was making noise before replacement, verify that the flap movement is smooth and unobstructed to avoid premature failure of the new unit.

High-quality Magneti Marelli heater servo motor EAM590 (6447LW) designed for reliable operation in Citroën and Peugeot HVAC systems. Intended primarily for professional garages and experienced DIY mechanics, this actuator restores precise flap control for heating and ventilation, eliminating incorrect airflow distribution, unusual noises, or failure to change temperature settings. The part is ideal when the original actuator shows play, broken plastic gears or electrical faults. Common search terms: Magneti Marelli EAM590, 6447LW, Citroën C8 heater motor, Peugeot 807 HVAC actuator, blend door actuator.

Technical Information

• Manufacturer: Magneti Marelli
• Model: Citroën C8; Peugeot 807 (also used on other Citroën and Peugeot models equipped with the same actuator)
• Product Codes: EAM590; 6447LW
• Other Numbers: 6447LW (alternative formatting: 6447.LW)

Function

This servo motor drives HVAC flaps inside the heater box to control air distribution and blend of hot/cold air. It converts electrical commands from the climate control unit into precise mechanical movement of the flaps, ensuring correct cabin temperature and airflow direction. A faulty servo can cause stuck vents, incorrect temperature, or clicking noises from the dashboard.

Compatibility And Fitment

Direct replacement for vehicles fitted with Magneti Marelli EAM590 / 6447LW heater actuators, most notably Citroën C8 and Peugeot 807. Compatibility is typically determined by matching the product code on the old actuator. Fitment can vary by production year and equipment level; when the existing actuator bears code 6447LW or EAM590, this unit is the intended replacement.

Installation Recommendations

• Prepare the vehicle: park on level ground and remove ignition key.
• Access: The actuator is usually located on the HVAC unit behind the glovebox or lower dashboard. Remove trim panels or the glovebox to reach the heater box.
• Disconnect electrical connector and remove retaining screws. Note the orientation of the actuator and any splined shaft position before removal.
• Install the new actuator in the same position, secure screws and reconnect the electrical plug. Ensure flaps move freely and are correctly engaged with the mechanism.
• Verify operation: cycle the climate control through all modes and temperatures to confirm correct movement and absence of abnormal noises.
• Recommended Tools: Torx/Phillips drivers, trim tools, basic multimeter for quick electrical checks.

Common Failure Causes

• Worn or broken plastic gears inside the actuator causing play or loss of movement.
• Motor burnout or worn brushes resulting in intermittent or no operation.
• Water ingress or contamination from leaks leading to corrosion and mechanical seizure.
• Mechanical binding of HVAC flaps caused by foreign objects or debris.
• Age and frequent operation accelerate wear; failures often appear as clicking noises, inability to change vent positions, or incorrect cabin temperature control.

This Magneti Marelli EAM590 (6447LW) heater servo motor is a practical, service-focused replacement that helps restore HVAC function quickly and reliably when the original actuator fails. Suitable for professional installation; competent DIYers with basic tools can also perform the swap following the steps above.

This Valeo heater servo motor is a direct-fit HVAC actuator designed for Citroën C4 II and Peugeot 308 T7 models. It controls the movement of heater/ventilation flaps to regulate airflow direction and blend temperature inside the passenger compartment. The part is commonly searched by product codes such as T1009914P and 6479E7, making it easy for professional technicians and DIY enthusiasts to find the correct replacement.

Designed for workshops and competent DIY mechanics, this servo motor restores precise flap control, eliminates erratic ventilation behaviour and reduces unwanted noises from the dashboard area. Typical symptoms that indicate a faulty actuator include inconsistent air distribution, inability to change temperature properly, clicking or grinding noises behind the dash, and stuck vent doors. Replacing the faulty actuator returns full HVAC functionality and improves cabin comfort.

Technical Information

• Manufacturer: Valeo
• Model: Citroën C4 II; Peugeot 308 T7
• Product Codes: T1009914P; A 6479E7
• Other Numbers: 64790000000

Function

The unit is an electric servo (HVAC actuator) that drives heater and ventilation flaps (air distribution and blend doors). It converts electrical control signals from the climate control module into mechanical movement of internal ducts, enabling proper temperature mixing and airflow direction.

How To Replace

• Safety First: Always disconnect the battery before starting work to avoid short circuits and potential damage to electronic components.
• Access: Depending on the model, access is typically gained by removing the glovebox or a small dashboard panel on the passenger side to reach the HVAC housing.
• Disconnect: Unplug the electrical connector and remove the retaining screws or clips that hold the actuator in place.
• Remove & Install: Remove the old actuator, fit the new unit in the same orientation, secure fasteners and reconnect the electrical connector.
• Test: Reconnect the battery, cycle the ignition and operate the climate controls to verify smooth flap movement and correct airflow. In most cases the actuator is plug-and-play and requires no additional programming.

Installation Recommendations

• Follow vehicle manufacturer access and removal procedures to avoid damaging dash trim or HVAC components.
• Handle the servo and its plastic gears carefully; do not force linkages when fitting to prevent gear stripping.
• Check and clear any debris or foreign objects inside the HVAC housing that might obstruct flap movement.
• If unusual noises persist after replacement, inspect linkages and duct mounts for binding or broken clips.

Why The Part Most Commonly Fails

Actuators commonly fail due to worn or stripped plastic gears, internal potentiometer wear, motor burnout from prolonged use or overload, and ingress of moisture or dust leading to corrosion. Repeated full-range cycling, high mileage, and brittle plastic after long-term heat exposure accelerate wear. Mechanical stress from obstructed flaps or broken mounting points can also cause premature failure.

Buy this Valeo heater servo motor if you need a reliable replacement for faulty HVAC flap control on Citroën C4 II or Peugeot 308 T7. The product codes listed above help ensure quick identification and fitment for repair jobs in the workshop or for competent DIY maintenance.

This air conditioning pipe is designed for PSA vehicles equipped with the 1.6 e-HDi engine family. It is a direct-fit refrigerant line used in the vehicle’s A/C circuit and commonly searched for by original part numbers. Robust construction ensures reliable routing of refrigerant between system components while maintaining system pressure and sealing at connection points.

Ideal for professional workshops and DIY mechanics, this AC pipe is suitable when diagnosing poor cooling, visible oil stains at pipe connections, or audible hissing from the refrigerant circuit. Replacing a damaged or leaking pipe restores refrigerant integrity and avoids further damage to compressor and other A/C components.

Technical Information

• Manufacturer: Stellantis (Citroën/Peugeot)
• Model: Citroën C4 II; Peugeot 308; Peugeot 3008; DS4 (1.6 e‑HDi)
• Product Codes: 9670651880; 6477Z9
• Additional Numbers: 6477Z9; 9670651880

Installation Recommendation

• Recover refrigerant from the A/C system using certified equipment and following local regulations—never vent refrigerant to atmosphere.
• Inspect mounting points, clamps and adjacent hoses for abrasion or damage. Replace worn O‑rings and seals at every connection to ensure leak‑free joints.
• Lubricate new O‑rings with the correct refrigerant oil before assembly and tighten fittings to manufacturer guidelines.
• After installation, evacuate the system with a vacuum pump to remove air and moisture, then recharge the system to the vehicle manufacturer’s specification and perform a leak test.
• If unsure, have the replacement performed by a workshop with A/C service equipment to guarantee correct evacuation, oil charge and refrigerant fill.

Most Common Failure Reasons

• Corrosion and material fatigue at joints and bends, especially in regions exposed to road salt or moisture.
• Abrasion from contact with other components or routing that allows chafing over time.
• Damaged or hardened O‑rings and seals leading to slow leaks.
• Impact from road debris or improper previous repair/installation that stressed fittings.

Common search terms: “9670651880”, “6477Z9”, “Citroën C4 II AC pipe”, “Peugeot 308 AC line”, “AC pipe 1.6 e‑HDi”—use these references when sourcing the correct replacement for fast identification.

Replacing a leaking A/C pipe promptly prevents refrigerant loss, maintains compressor lubrication and restores full cooling performance. For safety and compliance, always handle refrigerant systems with appropriate tools and certification.

High-quality Valeo HVAC servo motor designed as a direct-fit motor-reducer for climate control systems on selected Citroën and Peugeot models. Ideal for professional workshops and experienced DIY mechanics, this servo restores precise flap movement and reliable airflow direction control in the HVAC unit. Frequently searched under product codes T1000467T, 2512101A and 647914, this part is a common replacement when doors stick, make noise, or fail to respond to climate system commands.

Key Features And Benefits

– Direct-fit replacement for the original HVAC actuator with internal reduction gearing for increased torque and smooth operation.
– Restores correct distribution of air (mode doors) and contributes to proper temperature regulation when the blend door is affected.
– Commonly used by garages and home mechanics as a cost-effective repair to avoid more complex HVAC disassembly.
– Supplied with standard electrical connector compatible with original harness (verify pin layout before installation).

How It Works And Typical Symptoms

This motor-reducer drives the HVAC flaps (mode/blend/recirculation as applicable) to control airflow direction and mixing of hot/cold air. Typical failure symptoms include clicking or grinding noises from the dashboard, vents stuck in a single position, incorrect airflow direction, fluctuating cabin temperature, or no response when changing climate settings. In some vehicles the climate system may report a fault code related to flap position or actuator circuit.

Replacement Guide

Basic replacement steps (vehicle-specific access may vary):
1. Disconnect the negative battery terminal before beginning work.
2. Remove the necessary trim panels or glovebox to access the HVAC housing (locations differ by model).
3. Unplug the electrical connector from the actuator and remove the securing screws or clips.
4. Carefully extract the old unit, noting the orientation and spline alignment of the drive shaft.
5. Fit the new motor-reducer, align the splines, secure with screws, and reconnect the electrical plug.
6. Reassemble trim and reconnect the battery. Run the climate controls through full cycles to confirm correct movement and operation.

Installation Recommendations

– Always disconnect the battery before removal and follow the vehicle manufacturer’s instructions to avoid damage to electrical components.
– Verify connector pinout and physical fit before final installation.
– After fitting, operate the HVAC through its full range (hot/cold and all mode positions) to ensure proper calibration and that no obstructions remain in the ducting.
– If access is restricted or calibration is required beyond simple cycling, have the job performed by a qualified technician.

Most Common Failure Causes

– Worn or broken plastic gears inside the reducer due to age and repeated motion.
– Water ingress or contamination from leaks in the HVAC housing or cowl area.
– Overheating or electrical faults causing motor failure.
– Mechanical obstruction or collapsed ducting placing extra load on the actuator.

Technical Information

• Manufacturer: Valeo
• Model: Citroën C2; Citroën C3; Citroën C3 Picasso; Citroën C4 II; DS4; Peugeot 308
• Product Codes: T1000467T, 2512101A, 647914
• Additional Numbers: 2512101A, 647914, T1000467T

Notes For Mechanics

This actuator is aimed at professionals and competent DIYers. Keep replacement parts and fasteners organized during disassembly to ensure correct reinstallation. If the HVAC system continues to behave irregularly after replacing the actuator, inspect ducting, flap mechanisms and electrical supply for related issues.

High-quality DENSO AC compressor compatible with many Stellantis models. Ideal for professional workshops and DIY mechanics seeking a direct-fit replacement for faulty or noisy compressors. Frequently searched by part numbers 447150-3250, 9802875780, 9819714980, 9827528980, 9827552180 and 1617294480 — include these codes in your search to find exact fits and cross-references.

Product Overview

This DENSO compressor is a belt-driven unit designed to compress and circulate refrigerant in the vehicle air conditioning system. It includes the clutch assembly and electrical connector as found on the donor vehicle. The compressor was removed from a vehicle with 94,000 km and is suitable for replacing failed units in compatible Citroën, Peugeot and related models. It restores cold-air performance when installed correctly and paired with a clean, correctly serviced A/C system.

Technical Information

• Manufacturer: DENSO
• Model: Citroën Berlingo, Citroën C2, Citroën C3, Citroën C4 II, DS4, Xsara, Xsara Picasso; Peugeot 206, Peugeot 307, Peugeot 308 T9, Peugeot Partner, Peugeot Rifter; selected Fiat and Opel models
• Product Codes: 447150-3250, 9802875780, 9819714980
• Other Numbers: 9827528980, 9827552180, 1617294480

Function And Symptoms

The compressor is the heart of the A/C system: it compresses low-pressure refrigerant vapour into high-pressure vapour and drives circulation through the condenser, expansion device and evaporator. Typical failure symptoms include loss of cooling, A/C clutch not engaging, abnormal noise from the compressor area, visible oil or refrigerant leaks and seized compressor causing belt slippage or breakage.

Common Causes Of Failure

• Contamination in the system (metal debris, moisture) that damages internal components
• Lubrication loss due to refrigerant/oil leak, causing bearing or piston wear
• Electrical clutch coil failure or connector corrosion
• Overheating from low refrigerant charge or blocked condenser
• Age and normal wear, especially in vehicles with high mileage or poor maintenance

Replacement And Installation

1. Recover refrigerant using certified A/C recovery equipment in accordance with local regulations.
2. Disconnect the battery and follow vehicle manufacturer safety procedures.
3. Remove accessory belt and disconnect electrical connector from the compressor clutch.
4. Undo mounting bolts and remove the compressor. Inspect system for debris and contamination.
5. Replace O-rings on high- and low-pressure lines with correct sizes lubricated with the specified oil.
6. If contamination is present, flush the system or replace affected components (condenser, receiver/drier or accumulator, expansion valve) to prevent rapid re-failure.
7. Install the replacement compressor, torque fasteners to manufacturer specification, evacuate the system with a vacuum pump and recharge with the correct refrigerant type and oil volume as specified by the vehicle manufacturer.
8. Check for leaks, verify correct clutch engagement, and confirm cooling performance during a road or bench test.

Installation Recommendations

• Always use proper refrigerant recovery and charging equipment. Never vent refrigerant to atmosphere.
• Replace receiver/drier or accumulator when replacing the compressor if the system has been opened or contaminated.
• Use the manufacturer’s specified refrigerant oil type and quantity (typically PAG for modern systems) and follow torque settings from the repair manual.
• Perform a full system vacuum and leak test before charging. Run the system to circulate oil and verify operation.
• Professional installation is recommended for correct evacuation, charging and leak checking, but experienced DIY mechanics with appropriate tools can perform the job safely.

Most Common Reason For Failure

The single most common cause of compressor failure is contamination and lubrication loss in the refrigerant circuit. Debris from a failing component or moisture in the system accelerates internal wear and can lock the compressor, making replacement necessary. Preventive maintenance and prompt repair of small leaks significantly reduce the risk of compressor damage.

This heating servo motor (HVAC actuator) is a direct-fit electrical component designed to control the flap positions in the heating and ventilation system on a range of Citroën and Peugeot models. It is commonly used by professional mechanics and experienced DIYers as a reliable replacement for worn or failed actuators. The unit restores correct air distribution and blend control, eliminates unwanted noises from the dashboard, and restores precise temperature mixing.

Key Features

• Direct-fit replacement for original Valeo servo motors.
• Operates blend and distribution flaps in the HVAC box to control airflow and cabin temperature.
• Compact electrical motor with integrated position feedback for accurate flap positioning.
• Commonly identified and ordered by part numbers listed below.

Technical Information

• Manufacturer: Valeo
• Models: Citroën C5 I, Citroën Xsara, Peugeot 406, Peugeot 607
• Product Codes: 653118V.E, 653118V.C
• Other Numbers: 653118V.C 05, 653118V.C 06, 653118V.C 08, 653118V.C 09, 653118V.E 11, 6447HH

How It Works

The servo motor receives signals from the climate control unit and moves internal flaps in the heater box to regulate airflow distribution and temperature blend. Position feedback inside the actuator allows the climate controller to confirm flap position and adjust as needed.

Common Failure Causes

• Worn or broken plastic gears inside the actuator (most frequent cause).
• Motor burnout due to age, high usage, or electrical surges.
• Moisture ingress or contamination from debris in the HVAC box leading to binding or corrosion.
• Poor electrical contact or connector corrosion causing intermittent operation.

Replacement Procedure (Overview)

• Disconnect the battery before starting work to avoid electrical damage.
• Access the actuator—locations vary by model (commonly behind the glovebox, under the dash, or on the HVAC box). Remove necessary trim panels to reach the unit.
• Note the flap positions and mark orientation if needed. Unplug the electrical connector and remove the securing screws or clips.
• Install the new actuator in the same orientation, secure it, and reconnect the electrical connector.
• Reconnect the battery, test the HVAC functions and cycle all modes to verify correct movement and calibration before reassembling trim.

Installation Recommendations

• Always Disconnect The Battery Before Removal/Installation To Protect Electronics.
• Inspect The HVAC Box For Debris Or Broken Flap Parts That May Damage The New Actuator.
• Check Electrical Connector Pins For Corrosion; Clean And Apply Suitable Contact Protection If Needed.
• Test The New Servo Motor Function Before Final Reassembly: Cycle Temperature And Air Distribution To Confirm Correct Operation.
• Use Genuine Replacement Screws/Clips And Avoid Overtightening Plastic Mounts.

Why Replace This Part

Replacement restores proper climate control functionality: eliminates irregular airflow, incorrect temperatures, and clicking or grinding noises from the dashboard. Addressing a failing actuator early prevents additional stress on adjacent HVAC components and saves time on further diagnostic work.

Notes

Part is commonly searched by the product codes listed above. Verify part numbers against vehicle application fitment when ordering to ensure correct fit for your specific model and year.

This Heater Fan Regulator (part number 644178) is a direct-fit electrical component for a range of older Citroën and Peugeot models. It controls the blower motor speeds of the heating and ventilation system, restoring regulated airflow and reliable climate control. Designed for professional workshops and experienced DIY mechanics, this unit is a practical replacement when low or missing fan speeds, intermittent blower operation, or visible damage to the resistor pack is diagnosed. Supplied for a wide variety of models, it increases serviceability of older Stellantis vehicles and helps return comfortable cabin ventilation quickly.

Technical Information

• Manufacturer: Stellantis / Citroën / Peugeot
• Model: Citroën AX, Saxo, Xantia, XM, Berlingo, Xsara, ZX; Peugeot 106, 405, 406, 605, Partner
• Product Codes: 644178
• Other Numbers: Not Available

Function And Symptoms

The regulator (blower resistor) modulates current to the heater blower motor to provide selectable fan speeds. Typical symptoms of a failing unit include loss of one or more blower speeds (often only high speed remains), intermittent blower operation, humming or burning odor from the dash, or visible heat damage/corrosion on the resistor module. Replacing the regulator usually restores all fan speeds when the blower motor itself is serviceable.

How It Is Replaced

Typical replacement steps (vehicle-specific details may vary):

• Disconnect the negative battery terminal to prevent short circuits when working on electrical connectors.
• Access The Regulator: It is commonly mounted in the heater box near the blower motor. On many models this is reachable from the passenger footwell after removing the glovebox or an access panel.
• Unplug The Electrical Connector and remove the mounting screws securing the resistor pack to the heater housing.
• Replace The Unit And Reassemble: Fit the new regulator, secure screws, reconnect the plug and battery, then test all blower speeds and functions.
• Verify Operation: Test fan speeds at each setting and check for unusual noises or overheating. If only high speed works after replacement, inspect the blower motor for excessive current draw or worn brushes.

Installation Recommendations

• Use Basic Electrical Safety: Disconnect the battery before starting work and avoid pulling on wiring — release connector clips carefully.
• Inspect The Blower Motor And Connectors: A failing blower motor can overload and rapidly damage a new resistor; measure motor current if possible.
• Clean Contact Surfaces: Remove corrosion from connector pins and apply a small amount of dielectric grease to protect against moisture.
• Check Mounting Seals: Ensure the heater box seals are intact to prevent water ingress that can corrode the resistor in the future.

Why This Part Fails Most Often

• Overheating: Resistor tracks can burn out with age or when the blower motor draws excessive current.
• Corrosion And Moisture Ingress: Water or high humidity in the heater box causes connector and resistor failure.
• Electrical Problems: Loose connectors, shorts, or poor grounding increase heat and accelerate wear.
• Blower Motor Wear: Worn brushes or a partially seized motor increase current draw and shorten the resistor’s lifespan.

Additional Diagnostic Tips

Before replacing the regulator, check for:

• Voltage At The Connector With The Fan Switched On (compare to battery voltage).
• Excessive Current Draw From The Blower Motor—an indicator the motor may be failing.
• Visible Damage Or Burn Marks On The Old Resistor Pack.
• Intermittent Operation Caused By Loose Connectors—clean and reseat before replacement.

This replacement part is aimed at professional mechanics and competent DIYers familiar with electrical diagnostics and safe workshop practices. Proper inspection of the blower motor and connectors will maximize the lifespan of the new regulator and avoid repeated failures.