The coolant temperature sender changes resistance as the coolant temperature increases and decreases.
Removal & Installation
- Disconnect the negative battery cable.
- Drain the engine cooling system to a level below the sensor.
- Release the locktab and disengage the sensor connector.
- Using a special sensor tool or a deep 12-point socket, loosen the sensor, then carefully unthread and remove it from the engine.
Thread the sensor into the engine by hand, then tighten using the socket or tool. If a replacement sensor came with instructions use a torque wrench to assure proper tightening.
NOTEThe manufacturer suggests coating the coolant sensor threads with a sealant such as 1052080, or equivalent.
- Engage the sensor wiring harness.
- Connect the negative battery cable.
- Properly refill the engine cooling system, then run the engine and check for leaks.
- Remove the sender from the vehicle.
- Place the sender in a container of water.
- Connect one lead of a ohmmeter to the sender terminal and the other lead to the sender body.
- Place a thermometer in the container of water and heat the water.
- When the water is cool the resistance should be high. As the water temperature increases the resistance should decrease smoothly.
- If not, the sender is probably faulty.