Voltage to the blower motor goes hot, when you turn the key on. Hvac controls on/off, blower speeds on the blower motor ground circuit. I'd start by testing the ground circuits. Those different color wires, coming off the resistor, all grounds. May be a problem with hvac control assembly. You could use a jumper wire for redundant ground, see if the different speeds work?
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Monday, April 5th, 2010 AT 2:26 PM