High-quality Sun Radiation Sensor (Part No. 6445V6) designed for Citroën and Peugeot climate control systems. This sensor measures incoming solar radiation and provides the data the automatic climate control needs to adjust blower speed, blend doors and air conditioning output for consistent cabin comfort. Ideal for professional workshops and DIY mechanics who need a reliable replacement part that restores correct automatic HVAC behaviour. Common search terms: Sun Sensor, Solar Sensor, Sunlight Sensor, Citroën Sun Sensor, Peugeot Sun Sensor, 6445V6.

Key Benefits

– Restores Automatic Climate Control Functionality: Ensures the HVAC system properly compensates for direct sunlight and prevents overheating or overcooling of the cabin.
– Simple Swap: Designed as a direct replacement for the original sensor housing and connector (check product codes).
– Workshop-Friendly: Useful for technicians troubleshooting intermittent automatic HVAC faults related to solar input.

Typical Fitment

This sun sensor is commonly fitted to Peugeot 406 and is compatible with a range of Citroën and Peugeot vehicles from the same Stellantis platforms and generations. Always verify the part number (6445V6) against the existing unit in the vehicle before ordering.

Technical Information

• Manufacturer: Stellantis / Citroën / Peugeot
• Model: Peugeot 406 (and selected Citroën and Peugeot models)
• Product Codes: 6445V6
• Other Numbers: NFP (as indicated in source information)

Replacement Procedure (Overview)

1) Locate the sensor on the top of the dashboard near the windshield, typically in the centre above the instrument panel or infotainment area.
2) Remove the dashboard trim pieces with plastic trim tools to avoid damage.
3) Unplug the electrical connector from the sensor and release any retaining clips.
4) Remove the old sensor and install the new unit in the same orientation; ensure it sits flush and the connector is fully engaged.
5) Reassemble trim and verify automatic climate control operation (use A/C automatic mode and observe blower response to direct sunlight).

Installation Recommendations

– Use Plastic Trim Tools: Prevent scratches and broken clips when removing dash trim.
– Handle Sensor Carefully: Avoid touching or scratching the sensor dome/optics—contamination can degrade performance.
– Check Connector Condition: Inspect for corrosion or damaged pins; clean contacts if necessary before installation.
– Secure Routing: Ensure wiring is not pinched by trim and retains correct routing to avoid future electrical faults.
– Functional Check: After fitting, test the climate system in automatic mode and verify changes in blower speed when shading/unshading the sensor.

Why This Part Fails Most Often

– Environmental Exposure: Prolonged UV exposure, heat cycles and temperature extremes can degrade the sensor element or its housing.
– Moisture Ingress: Water or condensation reaching the connector or sensor body causes corrosion and intermittent or permanent failure.
– Mechanical Damage: Impact, improper removal or dashboard repairs can crack the sensor or damage its electrical connector.
– Age-Related Degradation: Over many years the sensor sensitivity can drift, resulting in incorrect automatic HVAC responses.

Practical Notes for Mechanics and DIYers

This part is a frequently replaced item when owners report the HVAC system running too aggressively or not compensating for strong sunlight. Replacement is straightforward for a trained technician or an experienced DIYer with basic trim tools. Keep the part number 6445V6 handy when locating the correct replacement unit and when searching catalogs or spare-part listings.