Genuine Volvo V50 Coolant Temperature Sensors

Volvo V50 Coolant Temperature Sensors Parts and Q&A

• Coolant Temperature Sensor
  30650752
  Q: How to diagnose and replace coolant temperature sensors on Volvo V50?

  A:

  The coolant temperature sensor, located in the Thermostat housing, provides an engine temperature source signal to both the engine management system and the instrument panel temperature gauge. If a fault occurs in the sensor or if there is a loss of signal due to poor electrical connections, a fault code will be logged in the engine management system ECU, which can be accessed via the diagnostic connector beneath the facia on the driver's side using a suitable fault code reader. In the event of a logged fault code, it is essential to carefully check the sensor wiring and connector, and while testing by substitution with a new unit is an option, further checks should be conducted using Volvo test equipment by a dealer or a suitably equipped specialist. To remove the sensor, first drain the cooling system, although if a replacement sensor is available, it may be possible to swap them with minimal coolant loss. For 1.8 and 2.0 litre petrol models, pull the plastic cover straight upwards, disconnect the wiring plug, and unscrew the sensor from the coolant outlet housing. For 2.4 litre petrol models, remove the air cleaner assembly, disconnect the sensor wiring plug, and remove the sensor from the thermostat housing, discarding the old seal if applicable. In 1.6 litre engines, the sensor is also located at the left-hand end of the cylinder head; disconnect the wiring plug, remove the retaining clip, and take out the sensor. For the 2.0 litre 4-cylinder engine, after removing the air cleaner housing, disconnect the wiring plug and pull the sensor from the thermostat housing. In 5-cylinder engines, for 2.0 litre models, disconnect the necessary pipes and remove the air intake pipe before disconnecting the wiring plug and pulling the sensor from the thermostat housing. For 2.4 litre models, disconnect the wiring plug and use a deep 19mm socket to unscrew the sensor. When refitting, apply sealant to the threads or use a new seal as needed, reconnect the wiring plug, and reassemble components. Finally, replenish or top-up the cooling system.