Cooling Fan Relay
If voltage is not present at fan relay Blue wire, repair Blue wire between cooling fan thermoswitch and cooling fan relay. If voltage is present at fan relay terminal Blue wire, check relay terminal No. 3 (Black wire) to ensure ground is present. If ground is not present at Black wire, repair Black wire. If ground is present, go to next step.
Check for voltage at fan relay connector terminal No. 2 (White/Blue), if voltage is not present, check fuse link "B" and in-line fuse under dash (next to junction box). If voltage is present at fan relay terminal No. 2, check for continuity between fan relay terminal No. 4 (Blue/Red wire) and fan motor connector. If continuity does not exist, repair Blue/Red wire. If continuity does exist, replace fan relay.
Cooling Fan Thermoswitch
Remove thermoswitch from vehicle. Using ohmmeter, ensure continuity is correct between wire connector and thermoswitch body at indicated temperatures. Thermoswitch may be gradually heated in water for testing.
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Sunday, May 30th, 2010 AT 5:08 AM