Diagnosis and Symptoms

1. If coolant temperature is below 190°F, proceed as follows:
a. Turn ignition switch on and ensure cooling fan is not operating.
b. If fan is operating, check for faulty fan relay and/or temperature (ECT) switch. Check too for separated electrical connectors or severed wire between radiator fan relay and temperature switch.
c. Disconnect temperature switch wire, then check that fan rotates.
d. If fan does not rotate, check No. 1 radiator relay, No. 2 radiator fan relay, cooling fan and fuses. Check also for short circuit between No. 1 fan relay and temperature switch.
e. Connect temperature switch connector.
2. If coolant temperature is above 207°F, proceed as follows:
a. Raise engine temperature above 207°F, then check that fan rotates.
b. If fan does not rotate, replace temperature (ECT) switch.
c. Allow coolant temperature to drop below 190°F. Fan should stop rotating.
d. If fan does not stop rotating, replace temperature (ECT) switch.