Description
Evaporator Temperature Sensor for Citroën and Peugeot Vehicles
Direct-fit evaporator temperature sensor 100439936 / 6445PA designed for Citroën and Peugeot HVAC systems. This sensor provides the evaporator temperature input to the climate control unit to prevent evaporator icing, optimize compressor operation and maintain stable cabin comfort. Ideal for professional workshops and experienced DIYers who need a reliable replacement part that restores correct A/C behavior and prevents nuisance cycling of the compressor.
Technical Information
- Manufacturer: Stellantis (Citroën/Peugeot Original Equipment)
- Model: Citroën C8; Peugeot 807
- Product Codes: 100439936, 6445PA
- Other Numbers: 100439936, 6445PA
Function And Benefits
The evaporator temperature sensor monitors the temperature of the evaporator core inside the HVAC housing. The climate control uses this signal to:
- Prevent evaporator freezing by limiting compressor operation when temperatures approach freezing.
- Optimize compressor cycling for fuel efficiency and cabin comfort.
- Provide input for automatic climate control algorithms to maintain setpoint temperatures.
Installation Recommendations
Typical replacement requires access to the HVAC evaporator housing, which is often located behind the glovebox. Follow these recommended steps:
- Disconnect the vehicle battery before starting to avoid short circuits and to protect electronic modules.
- Remove the glovebox or necessary trim panels to gain access to the HVAC case. Keep fasteners and clips organized.
- Locate the sensor on the evaporator housing, unplug the electrical connector and remove retaining clip or screw.
- Inspect and, if present, replace any O-ring or seal. Fit the new sensor in the same orientation and secure it firmly without over-tightening.
- Reconnect the electrical connector, reassemble trim, reconnect the battery and run the climate control to verify correct operation.
Key tips: Protect plastic clips and ducting during disassembly, avoid bending evaporator fins, and use a small amount of dielectric grease on connector pins if required to improve corrosion resistance. After replacement, use a diagnostic tool to check sensor readings and clear any related fault codes if necessary.
Why The Part Typically Fails
Common causes of sensor failure include:
- Moisture ingress and corrosion of the sensor element or connector contacts.
- Electrical connector damage or poor contact caused by vibration, contamination or broken locking tabs.
- Mechanical damage during disassembly of the dash or HVAC case, especially when removing the glovebox or ducts.
- Age and repeated thermal cycling leading to drift or open/short circuits in the sensing element.
Symptoms of a failing sensor typically include incorrect cabin temperature regulation, frequent compressor cycling or inability for the A/C system to prevent evaporator icing. Failure may be intermittent before becoming permanent; replacement restores correct temperature feedback to the climate control unit.
Fitment And Notes
Fits common Citroën C8 and Peugeot 807 applications carrying part numbers 100439936 / 6445PA. Confirm visual match with the original sensor and connector design before installation. Suitable for professional installers and experienced DIYers familiar with HVAC disassembly.
