Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
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Can I start by getting your VIN and the codes in the computer? Thank you!
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The first thing you are going to want to do is check the fuses and cooling fan relays and check to ensure that the cooling fans receive power when the relays are activated by the PCM.
If the powers to the relays and fuses check out good, then chances are the PCM is not grounding or activating the cooling fan relays. This is either due to a bad engine coolant temp sensor or a cooling system issue (such as low coolant, air pocket in the system, bad radiator cap or blown head gasket). Sometimes the PCM itself may go bad causing this issue as well but that would be a last resort.
Have you checked the relays and for power to the fan relays? Do you need a wiring diagram for this circuit?
It goes through the PCM.. which should allow the cooling fans to run (or at least one)
If this is the case, I suspect a power supply issue to the cooling fans or relays or simply a bad PCM.
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