Description
Interior Temperature and Humidity Sensor for Citroën and Peugeot Vehicles
This interior temperature and humidity sensor is designed for Citroën and Peugeot climate systems to provide accurate cabin climate readings and reliable HVAC control. Commonly searched by part numbers, this sensor helps the automatic climate control and ventilation system regulate temperature, manage blower operation and improve passenger comfort. It is suitable for workshop technicians and experienced DIYers who maintain Stellantis-built models and need a direct-fit replacement with known part references.
Technical Information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: Citroën C2; Citroën C3; Citroën C3 Pluriel; Citroën C5 II; Citroën C6; Citroën C8; Citroën Xsara; Citroën Xsara Picasso; Peugeot 307; Peugeot 407; Peugeot 607; Peugeot 807
- Product Codes: 9637937380, 6445HT
- Other Numbers: 52513D NFP
Function And Benefits
The sensor measures interior air temperature and relative humidity, supplying this data to the vehicle’s climate control module. Accurate readings ensure correct automatic heating, ventilation and air conditioning (HVAC) responses — reducing temperature swings, preventing unnecessary blower activity and helping the system decide when to activate air recirculation or air conditioning. Replacing a faulty sensor restores precise cabin climate control and improves passenger comfort.
Replacement Procedure
Typical replacement is straightforward for trained technicians or competent DIYers familiar with interior trim removal:
- Park the vehicle on a level surface, switch off ignition and disconnect the negative battery terminal if required by safety procedures.
- Remove the relevant dashboard trim or center console vent grille to access the sensor (location varies by model — commonly near the center vents or behind the glovebox area).
- Unplug the electrical connector from the sensor and carefully release any retaining clips.
- Install the new sensor in the same orientation, secure clips and reconnect the electrical connector.
- Reassemble trim, reconnect the battery if disconnected and start the vehicle. Verify correct temperature/humidity readings and normal HVAC operation.
Installation Recommendations
- Use suitable trim tools to avoid damaging dashboard plastics.
- Avoid touching the sensor sensing element directly; handle by the housing.
- Ensure connectors and pins are clean and fully seated; secure any retaining clips.
- After installation, perform a visual check of HVAC display and a short functional test (change temperature settings and fan speeds) to confirm correct behavior.
Common Causes Of Failure
- Moisture ingress and condensation leading to corroded contacts or degraded sensing element.
- Contamination from dust and debris inside vents, which can impair sensor readings.
- Connector corrosion, damaged wiring or intermittent electrical connections.
- Age-related drift of the sensing element resulting in incorrect temperature or humidity values.
Symptoms of a failing sensor include inaccurate cabin temperature display, erratic automatic climate control behavior, unexpected fan runs or failure of the HVAC system to maintain set temperatures. Replacing the sensor with the correct part codes listed above restores reliable operation in affected Citroën and Peugeot models.
