Description
Heater fan regulator for CITROEN AX, SAXO, XANTIA, XM, BERLINGO, XSARA, ZX and PEUGEOT 106, 405, 406, 605 and PARTNER cars
Part description
This heater fan regulator is a used car part intended for Citroën and Peugeot cars according to the codes and designations listed. It is an important electrical component of the heater, which is involved in controlling the operation of the fan and thus also in the proper functioning of the ventilation in the interior of the car.
The part is often searched for by the number 644178, making it easy to identify when replacing the original broken part. It is especially suitable for mechanics and DIYers who are looking for a cost-effective solution to repair heating and ventilation without having to purchase a new part.
Technical information
- Manufacturer: Stellantis Citroën Peugeot
- Model: Citroën AX, Saxo, Xantia, XM, Berlingo, Xsara, ZX; Peugeot 106, 405, 406, 605, Partner
- Other numbers: 644178
Product codes
- Product codes: 644178
- Models from labels: Citroën Berlingo, Citroën Xantia, Citroën Xsara, Peugeot 406, Peugeot Partner
Installation recommendations
For this part, the exact replacement procedure may vary depending on the specific model and make of the car. In general, however, the following recommended procedure applies to the heating fan controller.
1) Before assembly
- Compare the new and original part by shape, connector, fit and product number 644178.
- Check the condition of the contacts, whether they are oxidized, overheated or mechanically damaged.
- Check the part for cracks, deformation or signs of excessive heat stress.
- Disconnect the battery before starting work, especially if you are interfering with the vehicle’s electrical installation.
2) Necessary tools and materials
- regular set of hand tools
- screwdrivers and possibly small socket wrenches
- flashlight
- electrical contact cleaner
- protective gloves
3) Step-by-step assembly procedure
- Turn off the ignition and disconnect the battery.
- Access the space where the heating fan controller is located.
- Carefully disconnect the electrical connector from the original part.
- Check both the connector and the supply wiring for looseness, contamination or damage.
- Dismantle the original regulator from the mount.
- Compare the disassembled piece with the new part, especially the design of the connector and mounting points.
- If necessary, gently clean the contact surfaces and the connector.
- Place the new regulator in place without using excessive force.
- Connect the electrical connector firmly.
- Check that the wiring is not stretched, pinched or in contact with parts that may heat up or move.
- Reinstall all covers and removed parts of the interior or access panels.
- Connect the battery and prepare the car for function check.
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4) Post-assembly checks and functional test verification
- Turn on the heating fan and verify that it responds in individual modes without interruptions.
- Watch for fluctuating fan speed or erratic operation.
- Check that the connector or the surrounding area of the part does not get excessively hot.
- After a short run, visually check again the correct seating of the part and the wiring.
5) The most common assembly mistakes + how to avoid them
- Exchanging a part by appearance: always compare the product number and the connector.
- Insufficiently inserted connector: after connection, check for firm seating.
- Installation on damaged wiring: always check the condition of the leads and contacts before replacement.
- Work without disconnecting the battery: for electrical components, this reduces the risk of short circuits and damage.
- Overlooking the real cause of the fault: if the fan does not work properly even after replacement, it is usually advisable to check the fan itself, the connectors and the related electrical wiring.
Reasons why the part is damaged
- Long-term heat load during operation of the heating fan.
- Overheating of contacts due to poor electrical connection or oxidation of the connector.
- Voltage fluctuations in the electrical installation or overloading of related parts of the system.
- Moisture and dirt which can impair the conductivity of the contacts and accelerate corrosion.
- Wear from long-term use, which is common for heating and ventilation components.
