- The engine should be cold when performing this procedure.
- Disconnect the battery negative cable.
- Drain engine coolant to below sending unit level. A quart or so should be sufficient.
- Disconnect the wiring from the temperature gauge sending unit.
- Unscrew the old sending unit.
- Coat the threads of the new unit with Teflon®tape or a temperature-resistant sealer.
- Tighten the sensor to 11-15 ft lbs. (15-20 Nm).
Reconnect wiring. Start the engine and check operation. Check for leaks at operating temperature.
The engine coolant temperature sensor is installed into a water jacket at front of intake manifold near rear of generator. If equipped with a 5.2L or 5.9L V-8 engine, removal/installation may be done from front of vehicle without removal of engine cover or air cleaner housing. If equipped with a 3.9L V-6 engine, the engine cover and air cleaner housing must be removed.
- Disconnect the negative battery cable.
For 3.9L engines:
- Remove engine cover.
- Remove air cleaner housing.
- Place a small mirror above sensor connector.
- Disconnect electrical connector from sensor. When removing connector from sensor, do not pull directly on wiring harness. Fabricate an L-shaped hook tool from a coat hanger (approximately eight inches long). Place hook part of tool under connector for removal. The connector is snapped onto the sensor. It is not equipped with a lock type tab.
- Partially drain cooling system.
- Remove sensor from intake manifold.
- Install sensor into intake manifold and tighten to 8 ft. lbs. (11 Nm).
- Connect electrical connector to sensor. The sensor connector is symmetrical (not indexed). It can be installed to the sensor in either direction.
- Refill any the engine cooling system.
For 3.9L engines:
- Install air cleaner housing.
- Install engine cover.
- Connect the negative battery cable.