Description
Interior Air Temperature Sensor
Overview
Replacement cabin temperature sensor designed for Citroën and Peugeot vehicles. This sensor measures the interior air temperature and provides the climate control unit with the data needed to regulate heating, ventilation and air conditioning for stable cabin comfort. Commonly referenced by part numbers 100439936 and 6445PA, it is a practical spare for professional workshops and DIY mechanics working on MPV models.
Applications
Suitable For: Citroën C8, Peugeot 807
Technical Information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: Citroën C8; Peugeot 807
- Product Codes: 100439936
- Other Numbers: 6445PA
How It Works
The sensor contains a temperature-sensitive element (typically a thermistor) that changes resistance with air temperature. The HVAC control module reads this signal and adjusts blower speed, blend doors and compressor engagement to maintain the selected cabin temperature.
Symptoms Of A Faulty Sensor
- Incorrect Cabin Temperature Readings On The Climate Control
- Oscillating Or Unstable Heating/Cooling Performance
- Continuous Cooling Or Heating Despite Set Temperature
- Increased Compressor Cycling Or Unusual HVAC Behavior
Replacement And Installation
- Locate The Sensor: Usually mounted in the HVAC housing or intake area of the climate unit—access often gained behind the glovebox or lower dashboard trim.
- Preparation: Switch Ignition Off And, For Safety, Isolate The Vehicle Electrical System If Required.
- Removal: Remove Any Trim Or Covers Blocking Access, Unplug The Electrical Connector And Carefully Extract The Sensor From Its Housing.
- Installation: Fit The New Sensor In Place Without Forcing It, Reconnect The Electrical Connector, Reassemble Trim, And Verify Proper Operation By Running The HVAC System Through Several Modes.
- Tip: Inspect Wiring And Connector For Corrosion Or Damage; Clean Contacts And Use Appropriate Dielectric Protection If Available.
Why The Part Most Often Fails
Cabin temperature sensors typically fail because of long-term exposure to moisture and dust, connector corrosion, or degradation from thermal cycling. Mechanical damage during previous repairs or contamination from cabin air debris can also impair sensor response, leading to incorrect signals to the HVAC control unit.
Recommendations
- When Replacing, Compare Part Numbers (100439936 / 6445PA) To Ensure Correct Fitment.
- Check Connector And Wiring Harness For Corrosion Or Broken Wires Before Installing The New Sensor.
- After Installation, Verify HVAC Response And Monitor Cabin Temperature Behavior During A Short Road Test.
