Quote:
Originally posted by evo626
If I turn the switch to 4 there is a voltage change. It goes all the way to 12.7v. The other speeds are lower and then voltage is taken from the blower wires. Should I still try to replace the control unit or could it be something else?
evo
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Where, exactly are you taking that voltage reading? At the blower motor or the resistor? And between what two wires? I will assume you are measuring the voltage between the two wires (blue and blue/black) at the blower motor connector. If so, then that's normal...when the switch is at "4", the blower motor is directly grounded (it is always supplied +12v through the blue wire) with no resistors in its ground path. If it's reading 12.7 volts at that connector when it's on "4", the motor should be working....... However I'm not sure where you're hooking your voltmeter leads up to so this may not apply.
Try this. set the switch to "4" and measure the resistance between any body ground and the blue/black wire on the blower motor or resistor harness connector. It should have continuity (less than 1 ohm) or zero volts if using a voltage measurement between these two places. If there is no continuity, it's almost certainly the blower switch.