ggchalmers

I have a 2007 Chevy avalanche LTZ. AC clutch will engage and I will get cold air.. but then the AC clutch 10A fuse will blow. I replaced the AC relay and the same still happens. I want to try and replace the AC Diode before I mess with the AC clutch but I cant seem to locate the Diode on the wire harness. Can anyone point out the location..with pic maybe?

KChevy75

If there is a A/C clutch diode, I'd suspected it would be in the fuse box and have a diode symbol on it. I don't see it listed on any parts supplier for the avalanche though.

How's the refrigerant pressure look when running?

Could be a chafed wire somewhere. I'd trace the harness from the a/c compressor back and see if any wire coatings are rubbed through.

kevinkpk

I can't imagine why there would be a diode in that system, other than in a control module.

tech2

when the clutch coil de-engergizes….like an ignition coil it induces voltage in the clutch circuit wiring...the diode is to absorb the voltage spike. I though it is part of the ac clutch ….easy way to check a diode is to unplug the coil and ohm the coil circuit one way then reverse the test leads. one way should be open other way continuity.

its quite possible the clutch coil is shorted. so you would want to ohm it anyways.

Oldcat

Yes. There is a diode. It is located at the compressor clutch connector. I doubt there is a problem with the diode. As was already stated, the clutch coil is probably shorted. I have replaced several coils for this reason.

ggchalmers

Thanks for the comments everyone... I will update with what I find.

Trukr

I can’t find it on my 2000 Silverado. I bought the part at Orielly’s but can’t find where it goes.