Question about Oldsmobile Alero

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I have a 99 olds alero that the coolant fans wont come on. I have switched the relays, tested the fuses, and wired the fans direct to check them out, and they were good. what do you think is the problem ?

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  • kerrybrentdu May 28, 2010

    thank you for your help

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If you have access to a scan tool, you can command the fans on manually. if the fans turn on manually, there could be a ECM related issue, or possible coolant temp sensor issue. if you cannot command them on, most likely problem is wiring. with the fans commanded on, check for power and ground at the connector. to check for ground, clamp a test lamp onto the positive terminal of the battery and probe the connector, if one lights up you have power. to test for power clamp your test lamp to the negative battery terminal and probe the connector. whichever one you do not have, start tracing the wiring back and look for a break in the wiring. good luck! and please comment any further questions you may have.

Posted on May 28, 2010

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