AC compressor no power. - Ford Powerstroke Diesel Forum
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Old 07-13-2014, 07:34 PM
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AC compressor no power.

As the title states I have no power to my ac compressor. I have checked the low pressure sensor about the evaporator and the high pressure sensor on the back of the compressor and have no power at either one. My number 6 fuse in the cab is good and not blown. Could any one help me with a wiring diagram of this electrical system? Or some knowledge about what else to check? My next guess is that the switch in the cab is bad or else its a dreaded short in the wiring somewhere...

Thanks for any and all help!
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Old 07-13-2014, 08:52 PM
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Check the plug that's at the front of the compressor. I just went thru the same issue and found that plug was broken. I spliced in a new plug and all is good.
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Old 07-13-2014, 08:57 PM
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My plug is fine, but now I think about it, in the harness between the alternator and ac compressor I found a piece of heat shrink with a diode soldered into the black wire and, tied into a few other wires, did you happen to see anything like that on yours? The way it looks it looks like it was done factory, but that's always something to check on when you see wires scabbed together like that.
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Old 07-13-2014, 08:59 PM
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No, I didn't see anything like that. I split the loom back about 6-8"
And checked all of the wires.
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Old 07-13-2014, 09:01 PM
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hmm could be some of my issue I guess, but I don't have any power to the low pressure switch and everything I have read says that is the first part of the circuit, so somewhere between the HVAC controls and the low pressure switch I have an issue I guess
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Old 07-13-2014, 09:28 PM
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Possibly, but that plug on the front of the compressor was causing mine not to work. Good luck!
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Old 07-14-2014, 05:31 PM
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Diode might be blown. Check the voltage before and after the diode. I think I have a schematic for the ac circuit, let me know if you need it.
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Old 07-18-2014, 08:19 PM
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Quote:
Originally Posted by dirtcrew51m View Post
Diode might be blown. Check the voltage before and after the diode. I think I have a schematic for the ac circuit, let me know if you need it.
if you could upload the schematic I would be very grateful! I cant check voltage, because I am not getting any voltage anywhere in the system, and the fuse isn't blown.
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Old 07-19-2014, 08:11 AM
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Here's the schematic from the 1997 EVTM. Cheers!
Attached Files
File Type: pdf 1997 Diesel AC.pdf (136.1 KB, 18 views)
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Old 07-20-2014, 08:10 PM
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thanks for the schematic! I figured it out, had a wire making a bad connection on the back of the HVAC controls. I now have AC! Thanks everyone!
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