Product Overview

This heater fan (blower motor) is a direct-fit replacement designed for Citroën Berlingo II and Peugeot Partner II models without air conditioning. It restores proper airflow through the heater core and the vehicle’s ventilation system, ensuring comfortable cabin heating and reliable ventilation for workshop repairs or DIY maintenance. The unit is commonly searched by its product codes 030666P and 6441R4.

Key Benefits

• Direct fit for Citroën Berlingo II and Peugeot Partner II (no A/C variants).
• Restores full airflow and heating performance.
• Straightforward replacement process suitable for mechanics and experienced DIYers.
• Commonly referenced by part numbers 030666P and 6441R4 for quick lookup.

Technical Information

• Manufacturer: Stellantis / Citroën / Peugeot
• Model: Citroën Berlingo II; Peugeot Partner II
• Product Codes: 030666P; 6441R4
• Other Numbers: –

Compatibility

Fits Citroën Berlingo II and Peugeot Partner II models that are equipped without air conditioning. Check the part codes (030666P / 6441R4) against your vehicle documentation or parts list when searching for the correct replacement.

Replacement And Installation

Typical replacement steps for a trained mechanic or experienced DIYer:

• Disconnect the negative battery terminal before starting work.
• Access the blower motor, usually located under the dash on the passenger side; removal of the glovebox or lower dash trim may be required.
• Disconnect the electrical connector and any associated harness clips.
• Remove the mounting screws/bolts securing the blower motor to the HVAC housing and extract the unit.
• Inspect the blower housing and ducting for debris, leaves, or water ingress; clean if necessary.
• Install the new fan assembly, secure mounting fasteners, reconnect the electrical plug, and test all fan speeds before reassembling trim.
• Reinstall any removed panels and reconnect the battery. Verify operation across all speed settings and listen for unusual noise or vibration.

Installation Recommendations

• Always disconnect the battery before removal and follow manufacturer safety procedures.
• Test the new blower motor electrically before full reassembly to save time if additional faults are present.
• Replace the cabin air filter and clean the blower housing to prevent premature wear from debris.
• Check related components (blower resistor/module, fuses, and connectors) when diagnosing partial or intermittent operation.
• Use appropriate tools (screwdrivers, Torx/metric sockets) and avoid forcing connectors to prevent damage.

Common Failure Causes

Heater blower motors typically fail for mechanical or electrical reasons. The most frequent issues are worn bearings or motor brushes, contamination by leaves/debris or water, and overheating from restricted airflow (for example, a clogged cabin filter). Electrical causes include faulty blower resistors or poor connector contacts which can result in loss of some fan speeds or intermittent operation. Symptoms include no airflow at any speed, fan working only on certain speeds, grinding or rattling noises, or a burning smell.

Diagnostics Tips

• If the fan does not run at any speed, check fuses and the blower relay first.
• When the fan works on only one speed, suspect the blower resistor or its connectors.
• Unusual noises often indicate worn bearings or a damaged fan wheel—inspect and replace the motor assembly if necessary.
• After replacement, verify airflow and noise levels at each speed setting to confirm correct installation.

Note

This description is focused on fitment and practical guidance for mechanics and competent DIY enthusiasts. The blower is typically searched by the codes shown above; please ensure the part numbers match your vehicle’s requirements before ordering.

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.

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Technical information

• Manufacturer: PSA
• Model: Citroën Berlingo II, Peugeot Partner II
• Product codes: 030840s, 6441S0
• Other numbers: N030840s

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