Quote:
Originally Posted by upallnight
There is a constant 12 volt feed to the fan no matter if the ac is on or not. The aux fan is also used for cooling the coolant in the radiator. If there is no constant 12 volt at the fan connector that means the 50 amps fuse has blown and the only way that fuse is going to blow is if there a direct short in the fan.
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Yes there is constant power to the connector and the aux fan is also used for supplemental radiator cooling. However, there is an AC aux fan switch and also a radiator fan switch that closes the circuit. Power to the fan was intended to mean to check if there is a complete circuit on wires that go into the fan to see if the fan is the problem or the AC switch. You could also do the test at the connector which would also verify if the fan or switch is bad. I was thinking it would be easier check near the motor as it could be that the problem is only the low speed that runs for AC.