A/c ?

[shmed]

my ac compressor   wont cycle?   is there a  trouble shooting chart for this?\
the gauges say  I haved over 100 psi in the lines,  ecm sol fuse  is   good      if I try an jumper the switch on the canister  it doesn't turn on?   ideas

[Steve Wood]

somewhere, I did a step by step walk through on AC troubleshootin g for the electrical side...don't see it at the moment

I would like to assume you checked the AC fuse in the fuse block as a starter.  You say you checked the ecm/sol

[Steve Wood]

The wiring diagrams are here  http://www.ihadav8.com/forum/index.php?topic=3981.msg58921#msg58921

but it would really help you to download the free copy of the manual and get all the info

[TWild]

Try unplugging the connector near the bottom front of the compressor. It's the one that supplies power to it and it has two wires. If you undo the tape that's wrapped around it, you should see a small diode that connects to each terminal of the connector. Make sure that the small wire that comes off each side of the diode aren't touching. If they are, straighten it out and then re-tape it. Plug it in and give it a try. I had the same issue and doing this fixed mine.


Good luck,


TW

[Steve Wood]

Here, I tried to find better copies  http://vortexbuicks-etc.com/ac_compressor_electrics.htm

Twild is right, that diode in the compressor plug is often a problem.

The rest can be easily traced with a meter or test light from the diagrams above-stay on the vin 7 circuits

[shmed]

thank you very much fellas   ill   check these out next.    yes both fuses are good,   I changed them anyways to be safe.  back to the oven I mean garage..

[shmed]

ok checked the diode  looks ok ,   does it matter which way it plugs into the compressor?

[Steve Wood]

I never paid any attention to which way it plugged.  I am sure, originally the connector was made to go in and lock so I would line it up that way if you can see the catch.

 With the engine running and the AC control set to AC, I would go back to the light green wire in the cycling switch and see if it has power.  If it does, that means the problem appears to be under the hood.

If it has power, then I would put a jumper in the connector and see if you have power on the light blue wire on the relay.

If you do, jump across the relay from light blue wire to the dark green wire that goes to the compressor.  The compressor clutch should click and engage.  Does it?

[shmed]

ok   so I tried both ways with the compressor plug no go either way...

the light green wire has power with engne running an with just key in on postion

I disconnected the relay (the one closest to the front of the car)   I have power   in 2 spots   with key on  an also when running.   when I jump the switch no other spots become energized.

[shmed]

no  click no anything.....

[Steve Wood]

So you have power on the light green wire.  When you connect that wire with a jumper in the cycling switch connector so that it now is connected to the light blue wire that goes to the relay....and then connect the light blue wire to the the dark green wire that goes to the compressor clutch...you get no click?

That would suggest the clutch is bad.  Too double check, jump off the battery positive pole to the dark green wire.

That should directly power the clutch so that it clicks and locks the clutch.  If it does not, you have a bad connection to the clutch or the clutch is bad.  Just to be sure of that diagnosis, I would verify the clutch is grounded via the ground side connection of the clutch because one of those pressure switches on the compressor could have failed and is not completing the circuit..

If you look at the bottom of the section diagram, the black wire on the connector goes to ground thru the high pressure switch.   You can jump the black wire directly to ground and see if that makes the clutch click before panicking about a bad clutch

[Steve Wood]

Of course, you can be even more simple by pulling the connector off and checking for continuity between the black wire in the connector and ground using your meter...

[shmed]

thanks steve….   would this work??\
\I pulled the connector off the compressor put power an ground to it   both ways    an nothing happened  would you say the clutch s arew bad?\

[Steve Wood]

yes, if you put power and ground to the clutch coil terminals and nothing happened, I would say that is a clutch that has gone bad.It does happen

Dave, quit Missing and offer your opinion

[Scoobum]

yes, if you put power and ground to the clutch coil terminals and nothing happened, I would say that is a clutch that has gone bad.It does happen

Dave, quit Missing and offer your opinion

Dave is missing is at his cottage for the long weekend...more than likely. C'mon Steve...wrack those brain cells!