Edmunds Answers

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  • thecardoc3 12/25/11 7:52 pm PST

    It cannot be a single fuse, while both circuits do share a power feed to the ignition switch, there are several other circuits that would also be affected if that was faulty. Even so, the correct routine is to get a schematic for one of the circuits that are not working, and diagnose that circuit. In the event the second problematic circuit would happen to share the failure point,just consider that a bonus.

    The blower is likely the easier circuit to diagnose first. Power comes from a 40 amp fuse in the underhood fuse block asssembly. Then it goes through the blower resistor block and gets grounded by the AC control head. Use a test light to see where you have power, and where you lose it.

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