A/C woes

[mhuppertz]

Funny Mark...
Well, I put the multimeter on the hot wire to the compressor clutch and it was dropping voltage when the clutch chattered. So I worked back to the relay on the fenderwell, and it was clicking with the beat of the cutout, so I swapped relays and it did the same thing.
Then I hotwired the clutch and it worked fine.
Since I replaced the cycle switch, maybe the next thing is the low pressure switch?

Too hot?
Then this YouTube link from an older 1980's movie is for you:
http://www.youtube.com/watch?v=DpktBGInl60
Mark.

[mhuppertz]

Not the low pressure switch.... fusable link would be an on or off kinda deal...

Next check, right headlight ground,... Hmmm

Not that either. PCM.

[lopez dodge]

i feel for you . pulled camper back up from abq heading up i25 midday not a/c is no fun

[mhuppertz]

105 degrees today in Albuquerque, new record.

[mhuppertz]

I ended up doing this to work around it. Something is up within the PCM, and I don't have a logic chart of the PCM function to figure out the exact issue.

[mhuppertz]

Of course I simplified the schematic where possible.
I hate to leave it hacked like this, but the issue is a poor ground either in the wires to and from the PCM or in the PCM itself.
The compressor is working perfectly now, cycling as normal.

[Diesel]

Wow that was tough

[Diesel]

Well now its my trucks turn Everything was fine and dandy and then today the compressor clutch is no longer engaged. Has a charge. I am guessing the compressor or clutch bit it? Too hot to do any testing and I am tempted to just put a new compressor on it anyway... Any tips for me to figure out what is broken?

[PToombs]

Just put power to the clutch and see if it kicks in or not. Simple test.