Genuine Volvo S70 Coolant Temperature Sensors

Volvo S70 Coolant Temperature Sensors Parts and Q&A

• Temperature Sensor
  9445153
  Q: How to replace coolant temperature sensors in the thermostat housing on Volvo S70?

  A:

  The coolant temperature sensor, located in the Thermostat housing, is used to provide an engine temperature source signal to the engine management system and to the temperature gauge located in the instrument panel. If there is a fault in the sensor or a loss of signal, from a lack of electrical connections, a fault code will be logged in the engine management system ECU which can be accessed through the diagnostic connector in the centre console with a suitable fault code reader. In the event of a logged fault code, it is important to carefully check the sensor wiring and wiring connector, further checks, in addition to testing with a new unit, should be carried out with Volvo test equipment and by a dealer. In order to remove the sensor, partially drain the cooling system to below the level of the sensor unit, loosen the clip, and disconnect the radiator top hose at the thermostat housing. Next, remove the two Trox bolts and remove the thermostat housing, disconnect the wiring at the adjacent connector and unscrew the sensor from its place in the thermostat housing. For refitting, install the new sensor unit with a blob of sensor sealant on the threads, reconnect the wiring connector, reattach the thermostat housing while tightening the screws firmly and reconnect the radiator hose before you top up the coolant level.
• Coolant Temperature Sensor
  9186486
  Q: How to remove and refit Coolant Temperature Sensors in a transmission on Volvo S70?

  A:

  To remove the sensor, you must first make the necessary operations and then pull the wiring connector sockets apart, removing the two-pin socket with pins 12 and 13. Depress the locking device at the base of the socket and push slightly out the red locking lug before removing the two pins from the socket. Drain the transmission fluid and clean around the sensor before unscrewing it off the front of the transmission housing making sure to have a container below to catch any spillage of fluid. Carefully record the routing of the sensor wiring and pull out clear to remove the sensor from the vehicle. For refitting, apply some petroleum jelly to the sensor O-ring seal, position the sensor, and tighten the sensor to the specified torque. Route the sensor cables back to where they were previously inserted and place the connector pins into the wiring socket with pin 12 as the blue/red cable and pin 13 as the blue/black cable before reattaching the connector sockets. Refit the cables and sockets into the connector housing and then reattaching the rubber grommet and cable clamps to the cable harness, and then reconnect the wiring connector. Finally, assemble the battery tray, battery and air cleaner assembly back together and top the transmission off with fresh transmission fluid.