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.

The BEHR heater blower fan is a direct replacement designed for Citroën Xsara II vehicles. It restores cabin airflow and heating performance by driving air through the HVAC unit. This part is commonly sought under the part numbers 6441J6 and 644J6, making it straightforward to locate for professional workshops and home mechanics alike.

Key Benefits

• Designed as a direct-fit replacement to simplify installation and minimize downtime.
• Restores consistent air circulation for heating, ventilation and demisting functions.
• Suitable for both routine repairs and HVAC overhauls in Citroën Xsara II models.

Function And Symptoms Of Failure

The heater blower motor circulates air through the vehicle’s heating and ventilation system. Common failure symptoms include reduced airflow, unusual noises (rubbing, grinding or rattling), intermittent operation or complete loss of blower function. Typical causes are worn bearings or brushes, accumulated debris inside the fan housing, or electrical issues in the connector/wiring or blower resistor.

Installation Guidance

Replacement is normally performed from under the dashboard on the passenger side or by removing the glovebox to access the blower assembly. General steps: disconnect the battery, remove trim or glovebox as required, unplug the electrical connector, unfasten mounting screws, remove the old blower and fit the new unit in reverse order. Always verify electrical connections and clear any debris from the evaporator/heater housing before final assembly. Recommended for experienced DIYers or professional technicians.

Durability And Maintenance

Blower motors can last many years but lifespan depends on usage, environmental conditions and clogging by leaves or dust. Regular cabin filter replacement and cleaning of the blower housing reduce stress on the motor and prolong service life.

Technical Information

• Manufacturer: BEHR
• Model: Citroën Xsara II
• Product Codes: 6441J6
• Additional Numbers: 644J6 NFP

Before purchase, confirm fitment by comparing part numbers with your vehicle documentation or by checking VIN-based compatibility. This helps ensure correct electrical connector type and mounting orientation for a hassle-free replacement.

The Valeo heater blower motor for Citroën Xsara (part no. 6441N0) restores reliable cabin airflow and temperature control. Designed as a direct-fit replacement for PSA group vehicles, this 12V heater fan is ideal for workshops and experienced DIYers searching by part number 6441N0.

Function and Common Faults

The blower motor forces air through the heater core and ventilation ducts, providing heated or cooled air to the cabin. Common failure modes include worn brushes, bearing wear, electrical connector corrosion, or debris blocking the fan. Typical symptoms are reduced airflow, unusual noises during operation, or complete loss of fan function.

Replacement Procedure

Basic replacement steps: disconnect the battery, remove the lower dash or glovebox access panel to reach the blower housing, unplug the electrical connector, remove mounting screws and extract the old motor, fit the new motor, reconnect and test. Always consult the vehicle-specific repair manual for torque values and safety precautions.

Fitment & Compatibility

Fits Citroën Xsara II models and compatible PSA Citroën/Peugeot applications. This part is frequently searched by the product code 6441N0; verify fitment with your vehicle VIN or OEM cross-reference before ordering.

Technical Information

• Manufacturer: Valeo
• Model: Citroën Xsara II (Xsara)
• Product Codes: 6441N0
• Other Numbers: PSA Citroën Peugeot

Installation Tips

Wear gloves and avoid contacting fan blades with bare hands. Check that connector pins are clean and secure, and test all blower speed settings after installation. If problems persist, inspect the blower motor resistor, fuses and wiring harness for related faults.

The Valeo heater blower fan is a direct-fit replacement part designed for Citroén and Peugeot vehicles. Compatible with common PSA part numbers, this unit restores consistent cabin airflow and heating performance. Suited for professional mechanics and experienced DIYers who require reliable, OEM-style components.

Key Features

• Direct-fit replacement by Valeo for seamless installation
• Restores warm-air circulation through the heater core for fast cabin heating
• Durable construction designed for long service life
• Compatible with listed manufacturer codes for straightforward part matching

Compatibility

Fits Citroén XSARA II and Berlingo I, and Peugeot Partner I models. Always verify the part number on your vehicle or existing component before ordering to ensure correct fitment.

Installation & Maintenance

Basic replacement steps: disconnect the battery, access the blower assembly (commonly located behind the glove box or under the dashboard), unplug the electrical connector, remove mounting screws or clips, swap the blower, then reconnect and test. Inspect related items such as fuses, wiring and the blower motor resistor or control module if the new unit does not operate immediately.

Common Failure Modes

Typical causes of blower malfunction include worn motor brushes, damaged bearings, foreign objects obstructing the fan wheel, or electrical faults in the resistor, control module or wiring. Symptoms include reduced airflow, loud or unusual noise, or intermittent operation.

Technical Information

• Manufacturer: Valeo
• Model: Citroén XSARA II; Berlingo I; Peugeot Partner I
• Product Codes: 6441L3, 644178
• Additional Numbers: 6441N3, 6441K4

Key Benefits

• Direct replacement for original Valeo heater blower units used in selected Citroën and Peugeot models.
• Restores proper cabin airflow for heating, ventilation and defogging functions.
• Simplifies diagnosis by matching common part numbers (see Technical Information).
• Suitable for professional mechanics and experienced DIY enthusiasts.

Function And Common Faults

The heater blower fan circulates air through the vehicle heater core and HVAC ducting, providing cabin heating, ventilation and helping to demist windows. Typical failure modes include worn bearings, brush or commutator wear in the motor, contamination from leaves or debris, and electrical connector or wiring faults. Symptoms of a failing blower include reduced or intermittent airflow, unusual noise from the ventilation area, or total loss of fan operation. Failures are more common in vehicles with high mileage, heavy use of ventilation, or where external debris can enter the intake.

Replacement Guidance

Replacement is straightforward for technicians familiar with PSA HVAC layouts. General steps:

• Disconnect the vehicle battery before starting electrical work.
• Access the blower housing (commonly located under the glovebox or behind the lower dash panel).
• Remove any trim or covers, unplug the electrical connector and remove retaining screws or clips.
• Extract the old blower assembly, fit the new Valeo unit, reconnect the connector and secure all fasteners.
• Reconnect the battery and test blower speeds and operation across settings.

If you are unsure about access panels or wiring, consult a service manual for the specific model or seek assistance from a qualified technician.

Durability And Maintenance

Service life depends on use and environment. Regularly clearing intake areas of leaves and debris and ensuring cabin filters are replaced on schedule reduces strain on the blower motor. Electrical checks for connectors and fuses can prevent premature failures. When diagnosing poor airflow, always rule out clogged cabin filters and duct obstructions before replacing the blower motor.

Technical Information

• Manufacturer: Valeo
• Model: Citroën Xsara II; Citroën Berlingo I; Peugeot Partner I
• Product Codes: 6441N3, 6441L3, 644178, 6441K4
• Other Numbers: Commonly referenced under PSA part listings and aftermarket catalogs using the codes above

This Valeo blower fan fits PSA heating systems and is commonly searched for by its product numbers. Always verify compatibility with the vehicle VIN or parts catalogue before ordering to ensure correct fitment.