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Radiator fans do not turn on. 12v feed directly to fan will make the fan operate
1999 Cadillac DeVille

Radiator fans do not turn on. 12V feed directly to fan will make the fan operate

(1999 Cadillac DeVille)
So the fans check out I also tested the 3 Relays under the fans, check out ok too. Fans will also work if the air conditioner compressor is on. But not under normal driving with Air conditioner off. The car starts to over heat until it is moving then the temp comes down rather quickly. The fan circuit has a problem. So tracing back what's next? So far I checked the fans, tested OK. Then tested each relay, tested OK. What feeds the primary circuit to the relays?
3 answers & 1 comment
Popular Answer
on December 03, 2012
Can't beat a GOOD scanner when checking these out!
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General Diagnosis
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on December 03, 2012
Can't beat a GOOD scanner when checking these out!
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of Greg's Orange Auto on December 04, 2012
agree with ziptie. get a diag and est so as to not waste time and $
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on December 03, 2012
May have multiple sensors/switches for that car. Need to know circuit for fan controls to start. Coolant temp sensor , or rad. fan switch, Some cars have them seperate , others combined . Need to know which you have , then you can test properly.In the meantime--when you come to a stop , turn on the A/C or defrost.
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on December 04, 2012
Thank You, I will investigate futher :-)

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