Description
Interior Air Temperature Sensor
This interior air temperature sensor (OEM Codes: 100439936, 6445PA) is a direct-fit replacement designed for climate control systems in Citroën C8 and Peugeot 807 models. The sensor feeds cabin temperature information to the HVAC control unit to ensure accurate automatic climate regulation, improving passenger comfort and system efficiency.
Typical Fitment And Use Cases: The part is commonly searched by its product numbers 100439936 and 6445PA, making it easy to find for mechanics and DIYers performing HVAC diagnostics or replacing a faulty cabin temperature sensor. Compatible With Citroën C8 And Peugeot 807. Ideal For Restoring Correct Automatic Climate Control Operation When The Cabin Temperature Reading Is Incorrect Or The System Cycles Frequently.
Technical Information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: Citroën C8; Peugeot 807
- Product Codes: 100439936; 6445PA
- Other Numbers: 100439936 | 6445PA
Function And Technology: The interior air temperature sensor measures the cabin air temperature and sends this signal to the climate control module. This sensor is typically a thermistor-based device (variable-resistance temperature sensor) that allows the HVAC system to adjust blower speed and temperature mix for stable cabin conditions.
Installation Recommendations
- Preparation: Park on a level surface and remove the ignition key. For safety and to avoid electrical faults, disconnect the negative battery terminal if you will be working near airbag circuits or extensive dashboard electricals.
- Access: The sensor is usually located behind the center dash area or close to the HVAC vent openings. Remove the necessary trim panels or glovebox components to reach the sensor housing without forcing plastic clips.
- Removal: Unclip the sensor housing, depress the electrical connector latch, and withdraw the sensor. Note the retaining clip or gasket orientation for correct reinstallation.
- Installation: Fit the new sensor in the same position, secure the retaining clip or seal, and reconnect the electrical plug. Reassemble trim panels carefully to avoid rattles and to maintain proper airflow paths to the sensor.
- Final Steps: Reconnect the battery if disconnected, start the vehicle, and allow the climate control to run through an automatic cycle. Clear any HVAC-related fault codes with a diagnostic tool if present, then re-check sensor readings and system behaviour.
Most Common Failure Reasons
- Moisture Ingress: Condensation or leaks can cause corrosion of the sensor or connector, leading to erratic readings.
- Connector Corrosion Or Poor Contact: Oxidation or loose pins at the connector causes intermittent signal loss to the HVAC control unit.
- Physical Damage Or Contamination: Dust, debris, or impact during dashboard work can damage the sensing element or its housing.
- Aging And Drift: Over time the thermistor characteristic can drift, producing inaccurate temperature readings and degrading automatic climate control performance.
- Wiring Harness Issues: Chafed or damaged wires between the sensor and control unit cause faults or open circuits.
Symptoms Of A Failing Sensor: Incorrect cabin temperature display, Poor Automatic Climate Control Regulation, Frequent Blower Cycling, Interior Temperature Different From Setpoint, Or HVAC Fault Codes Related To Sensor Input.
Replacement Of The interior air temperature sensor 100439936 / 6445PA is a cost‑effective repair that typically restores proper automatic climate function in Citroën C8 and Peugeot 807 vehicles. When diagnosing climate issues, checking this sensor and its connector wiring should be one of the first steps.
