I have a 2000 F250 and the blower motor stopped working, the a/c clutch locks in but the blower will not run. I back tracked and I have no power at the motor or the resistors, or the speed switch. There has to be a relay that is turned on by the a/c selector to power the blower circuit.
I guess my question is does anyone have a schematic of the a/c circuits? Or the location of the relay? Any help would be appreciated.

 

Sorry for stating the obvious, but did you check for a blown fuse?

 

Check fuse F22 under the dash. It supplies power to the MODE selector switch and energizes the blower relay in the underhood fusebox in any position except OFF. When the relay is energized, power is delivered from F23 to one side of the blower motor, the speed switch is in the ground side of the circuit and controls blower speed by changing the amount of current through (and the voltage across) the motor.

 

Thanks guys, Yes I checked the fuse, In my line of work I get calls from all over the country asking how to find or fix problems with air compressors, I have learned to ask the "simple" questions because sometimes it saves a lot of calls by checking the simple stuff first. Like "Does it have fuel?"
What I needed was the relay and fuse numbers to be sure what circuits to test power through. Why it seems such a hard thing to do as to label fuses in cars is beyond me. I'm not against putting the info in the owners manual, but as is the case with this truck, that was missing when we got the truck.

 

Read my signature.

 

Thanks projectSHO89, I've been on both sides of that quote. It certainly is better to keep one's mouth shut.

 

Well you could use

Motorcraft Technical Resource

Or
ALLDATA - OEM Auto Repair Information for Professionals

You can get a short term subscription at the Motorcraft site and download all you need.



Sean

 

I think he meant the link to download the manual.

It's also in his sig.