Description
Interior Air Temperature Sensor For Citroën And Peugeot Vehicles
This Interior Air Temperature Sensor (Ambient/Cabin Temperature Sensor) is a direct-fit electrical component for select Citroën and Peugeot models. Designed to provide accurate cabin temperature readings to the climate control module, it helps the automatic HVAC system regulate heating and air conditioning for stable comfort. Commonly searched under part number 643695, this sensor is suitable for technicians and DIY enthusiasts working on Citroën C5 (X7) and Peugeot 407 vehicles.
Technical Information
- Manufacturer: Stellantis (Citroën/Peugeot)
- Model: Citroën C5 (X7), Peugeot 407
- Product Codes: 643695
- Additional Numbers: Not Available
Function: The sensor monitors the interior/cabin air temperature and sends a voltage or digital signal to the climate control module. The control unit uses this information to adjust blower speed, vent distribution and compressor operation to maintain the set cabin temperature. Symptoms of a failing sensor include incorrect temperature display, poor temperature regulation, or erratic operation of the automatic climate control.
Installation Recommendations
Preparation: Park the vehicle on a level surface, switch off the ignition and remove the key. For electrical safety, disconnect the negative battery terminal if you will be working extensively on the wiring or airbag-connected panels.
Access: On Citroën C5 (X7) and Peugeot 407 models the interior temperature sensor is typically mounted in or near the HVAC housing or center console vent area. Access often requires removing a trim panel, glovebox liner or center console cover—refer to the model’s repair manual for exact removal points.
Replacement Steps (General):
- Locate the sensor inside the HVAC housing or dash vent area.
- Unplug the electrical connector by releasing the locking tab.
- Remove the sensor from its clip or housing (usually a simple push-fit or small retaining screw).
- Install the new sensor in the correct orientation and secure it in place.
- Reconnect the electrical connector and reassemble the trim panels.
- Reconnect the battery (if disconnected) and verify proper operation using the climate controls—check displayed cabin temperature and automatic regulation.
Why The Part Most Commonly Fails
Failure Modes: Interior temperature sensors are exposed to temperature cycling, humidity and dust inside the HVAC system. The most common causes of malfunction are connector corrosion, moisture ingress, degraded sensing element, or physical damage during previous repairs. Wiring faults or poor electrical contact at the connector can also produce intermittent or incorrect readings.
Service Interval: There is no fixed replacement interval. The sensor typically lasts many years under normal conditions. Replace the unit when symptoms appear (incorrect temperature readout, unstable climate control behavior, or stored HVAC fault codes) rather than on a scheduled basis.
Keywords For Search: Citroën Peugeot interior temperature sensor 643695, Cabin Temperature Sensor 643695, Citroen C5 Temperature Sensor, Peugeot 407 Ambient Sensor, HVAC Temperature Sensor Replacement.
