Description
Evaporator temperature sensor for Citroën and Peugeot vehicles.
This evaporator temperature sensor (part number 6445NZ) is designed for the HVAC systems of Citroën and Peugeot MPVs. It provides reliable temperature feedback to the climate control unit to prevent evaporator icing and to regulate compressor cycling. Engineered for professional workshops and competent DIYers, the sensor is an economical replacement that restores stable air‑conditioning performance and accurate cabin temperature control.
Technical Information
- Manufacturer: Stellantis (Citroën, Peugeot)
- Model: Citroën C8 (2002–2014); Peugeot 807 (2002–2014)
- Product Codes: 6445NZ
- Other Numbers: Not Available
Function And Symptoms
The evaporator temperature sensor monitors the temperature of the evaporator core and sends a signal to the climate control module. Its main role is to prevent the evaporator from freezing by allowing the control unit to cycle the compressor or adjust flaps/ventilation accordingly. Common symptoms of a failing sensor include intermittent or continuous compressor cycling, poor cooling performance, the evaporator icing up, inaccurate cabin temperature readings, or fault messages related to the climate system.
Replacement Procedure
Access Typically Requires Interior Trim Removal: The sensor is mounted on or near the evaporator inside the HVAC housing, usually under the dashboard or behind the glovebox. Replacement generally involves removing interior panels or the glovebox to reach the HVAC housing. In most cases the refrigerant circuit does not need to be opened because the sensor is clipped to the evaporator housing rather than being inside a pressurised refrigerant line, but always verify the exact location on the specific vehicle.
Basic Steps (Overview):
- Disconnect Negative Battery Terminal Before Working On Electrical Components.
- Remove Required Dash/Glovebox Panels To Reach The HVAC Housing.
- Unplug The Electrical Connector And Carefully Remove The Sensor From Its Clip Or Grommet.
- Install The New Sensor Ensuring Proper Seating And Seal; Reconnect The Connector.
- Reassemble Interior Panels And Reconnect The Battery. Verify AC Operation And Check For Fault Codes.
Why This Part Fails Most Often
- Connector Corrosion Or Moisture Ingress Causing Intermittent Electrical Contact.
- Mechanical Damage During Previous Repairs Or From Debris Inside HVAC Housing.
- Age‑Related Degradation Of Sensor Electronics Or Protective Grommet.
- Thermal Cycling And Condensation Leading To Erratic Readings.
Recommendations For Installation
- Inspect The Wiring Harness And Connector For Corrosion Or Damage; Repair As Needed Before Installing The New Sensor.
- Use A Small Amount Of Dielectric Grease On Connector Pins To Improve Long‑Term Reliability.
- Check That The Sensor Grommet Or Clip Seals Properly To Prevent Moisture Entry Into The HVAC Housing.
- Verify Operation With A Multimeter Or Diagnostic Tool After Installation; Clear Any Stored HVAC Fault Codes.
- If The Evaporator Was Frozen, Allow The System To Thaw And Verify There Are No Underlying Refrigerant Or Airflow Issues Causing The Freeze.
Part number 6445NZ is commonly used when searching for a direct replacement for Citroën C8 and Peugeot 807 climate sensor faults. Installing a new, correctly seated sensor typically restores consistent cabin temperature control and prevents compressor hunting caused by incorrect evaporator temperature readings.
