REMOVAL & INSTALLATION
- Disconnect the negative battery cable.
- Remove the upper cooling fan shroud-to-radiator support bolts.
- Disconnect the electrical leads from the fan motor. Remove the fan and shroud as an assembly.
- Position the fan and shroud assembly onto the radiator support and install the mounting bolts.
- Connect the electrical leads to the fan motor.
- Connect the negative battery cable. Start the engine and check for proper fan operation.
See Figures 1, 2 and 3
If the cooling fan fails to operate, there are 2 items to be checked; the first is the fan motor itself and the second is the thermo- switch. The fan motor can be checked as follows:
- Start the engine and allow it to reach normal operating temperature.
- When the radiator temperature reaches 230°deg;F, the electric cooling fan should turn on.
If the fan fails to operate, turn the engine OFF and perform the following procedures:
- Disconnect the electrical connector from the electric cooling fan.
- Using a fused jumper wire, apply battery voltage to the appropriate terminals.
- Make sure the motor runs smoothly, without abnormal noise or vibration.
- Reconnect the cooling fan connector and the negative battery cable.
The thermo switch or switches (some models have an auxiliary fan) control the operation of the engine fan, by completing an electrical circuit when the coolant temperature in the radiator reaches a certain operating temperature, usually around 185°deg;F.
Check the thermo sensor/sensors by removing them from their mounting position and immersing them in hot water up to the top of the threads. Using a volt-ohmmeter, check for continuity with the sensor in the hot water, there should be continuity at 185°deg;F-5°deg;F and NO continuity at 172°deg;F. If the sensor fails this test and the motor checks out OK, replace the thermo switch.