Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
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DO you have a test light? Can you check the cooling fan relay for power? See schematic attached
Do you have ground at 86? Can you cross 30 and 87 and make fan work?
The ECM controls ground. Have you checked both relays?
The black wire should be ground. and it is constant at the fan
2 should 1 should not
The black wire should be grounded near the bottom of the radiator support. check it for a ground.