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Can you clarify; turning the AC on switches the relays but the fans do not run, i.e. if you walk to the front of the car they are not running?
I ask because I have always assumed that the resistors fail by presenting an open circuit and you can verify their integrity by measuring their resistance < 1ohm between pins 30 of the low and high speed relay sockets. I have yet to let my car run long enough to have the high speed fans kick on. I should probably do the jumper trick to at least hear what they sound like.
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