Quote:
Originally Posted by Rube
I know there is enough thread on this fan issue for Mike in AZ to weave a Navajo rug, but here goes: Yesterday I picked up my 05 auto from the local tranny shop following an install of Greg Ducato's convertor and Servo. They had the battery disconnected a couple hours during the install and had it out for a test drive already. The fan was operating perfectly before, but now has no high speed. When I punch the AC button, it goes from slow to off. There must be a fuse or relay for me to check first. Where is it?
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You have two relays in the fan circuitry. Both of them are on the driver's inner fender panel, forward of the windshield washer fluid bottle. The black one is low speed (has the blue 12 ga. wire coming out of it) and the grey one is high speed (has the grey 10 ga. wire coming out of it).
The fan itself
does not have two separate circuits internally. High speed input goes directly to the motor and low speed input goes through an internal 1 ohm resistor to the same point inside the motor. The 1 ohm resistor limits the current through the motor and drops about 6 vdc in the process. Giving you about 6 volts to the motor on "low speed".
If you have the A/C on and the "recirculate" button pushed, you will drive the fan to high speed most of the time. Remember that the system pressures are the controlling factor here.
If you need any more troubleshooting help, send me a PM with your phone number and we can talk through it.
Regards,
Mike
