Description
Heater and Air Conditioning Fan for Citroën C5 and Peugeot 407
This blower motor assembly is intended for the climate control system of Citroën C5 II and Peugeot 407 models. It circulates cabin air through the heater core and evaporator, ensuring effective heating, ventilation and air conditioning performance. The part is frequently searched by its product numbers 4PUH-18456-BA and 6441S3, making it easy to find when ordering or replacing worn units.
Designed as a direct-fit replacement for the original equipment, this fan assembly restores airflow and reduces cabin noise when the existing motor starts to fail. Technically-minded DIYers and professional technicians will appreciate the straightforward fitment and the ability to verify compatibility by part number. Installing a new blower motor typically returns full function across all speed settings and eliminates intermittent operation, unusual noises, or reduced airflow caused by a failing unit.
Technical Information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: Citroën C5 II, Peugeot 407
- Product Codes: 4PUH-18456-BA, 6441S3
- Other Numbers: NFP
How The Part Functions
The blower motor spins the fan wheel that forces air through the HVAC system. It supplies warm air from the heater core or cooled air from the evaporator into the cabin and is controlled by the HVAC control unit and resistor/module to provide multiple fan speeds.
Common Reasons For Failure
Failures usually result from mechanical wear or contamination rather than a single sudden event. The most frequent causes are:
- Worn Bearings Or Brushes: Over time bearings wear out and brushes (in brushed motors) degrade, causing noise, reduced speed or total seizure.
- Debris And Dirt In The Housing: Leaves, dust and other debris can jam the fan wheel or overload the motor.
- Moisture And Corrosion: Water ingress or corrosion of electrical connections reduces reliability and can cause intermittent operation.
- Electrical Issues Upstream: Faulty blower resistors, control modules or poor power/ground connections can mimic motor failure; always check wiring and fuses during diagnosis.
Recommended Installation
Typical replacement is performed from the passenger-side footwell area. General steps for removal and fitment:
- Disconnect the vehicle battery to prevent short circuits.
- Remove the glovebox or under-dash trim to access the blower housing (location may vary slightly between Citroën C5 II and Peugeot 407).
- Unplug the electrical connector and remove mounting screws or bolts holding the blower assembly.
- Withdraw the old unit, inspect the fan housing for debris, and clean the area before fitting the new motor.
- Install the new blower assembly, secure fasteners, reconnect the wiring, and test all fan speeds and HVAC functions before reassembling trim.
Recommended checks during installation: replace or inspect the cabin air filter, verify blower resistor/module and fuses, and ensure connectors are corrosion-free and secure. Testing at all speed settings confirms proper installation.
Why Replace This Part
Owners typically replace the blower motor when they notice reduced airflow, loud or grinding noise from the dash, irregular fan speeds, or when the fan stops working altogether. Addressing a failing blower motor promptly prevents further strain on the HVAC control electronics and restores cabin comfort.
Part numbers 4PUH-18456-BA and 6441S3 are commonly used to locate this exact blower motor for Citroën C5 II and Peugeot 407 applications; searching by these codes improves chances of finding the correct replacement quickly.
