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post #1 of 10 (permalink) Old 08-06-2009, 02:45 PM Thread Starter
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Another A/C question

Hi all,
You guys really know your stuff and I've saved hundreds in the past while using this site.
I have tried to fix this by doing searches and using the process of elimination but can't figure this a/c problem out.

1st off it's a 1999 Concorde 2.7 with approx 78,000 miles.

Wife was driving, everything was fine,till nice cold a/c turned hot in a matter of seconds.

Found the compressor wouldn't engage. First checked the freon with guages and it went to red over 100 psi. ( never put any freon in before. Don't know why it was so high.)

Next checked all the fuses and relays and they were okay. Did a jump on the compressor relay and it did turn on (as did the cooling fans in a couple minutes) So power doesn't seem to be the issue.

Replaced the transducer figuring that had to be it with everything else checking out. Nope, still wont work.

Went ahead again and jumped the relay let it run for a couple minutes the air got semi-cool but not cold. Noticed the a/c lines were warm to the touch.

What am I missing here. All indications are the freon is low yet the guage reads over- pressurized.

Any thoughts on what to try next would be appreciated.

Thanks All!
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post #2 of 10 (permalink) Old 08-06-2009, 09:11 PM
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Your low pressure reading should be while running.

Sounds like you might have a low pressure situation actually, as though you might have suddenly dumped some pressure due to a bad compressor seal or something. Double check all your connectors under the hood, including bulk connectors, and look for any wires that are exposed to lots of water or road debris, and check for damage.

I was going to suggest transducer, but you already checked that. Double check to make sure it is screwed in all the way, and the connector is seated well...

and DO keep us posted.
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post #3 of 10 (permalink) Old 08-06-2009, 09:46 PM Thread Starter
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Thank you for your reply.

Yes the pressure tests right under 45 psi with the compressor going after I have to jump the relay to get it going. As soon as I pull the relay jumper wire and the compressor turns off it jumps to around 100 psi. I'm guessing the system isn't leaking since it 's holding the pressure.
I've switched back and forth with the new pressure switch and the old, still not kicking on.
At this point don't know what the problem could be.
Anymore suggestions on things to try would be appreciated.
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post #4 of 10 (permalink) Old 08-06-2009, 10:12 PM
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Could be that your relay is bad, try swapping it with a known good one (like your brights)...

see if that works. I've seen relays go bad pleanty of times.
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post #5 of 10 (permalink) Old 08-06-2009, 11:40 PM
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Quote:
Originally Posted by Lakelander View Post

Next checked all the fuses and relays and they were okay. Did a jump on the compressor relay and it did turn on (as did the cooling fans in a couple minutes) So power doesn't seem to be the issue.
What exactly are you doing when you "Did a jump on the compressor relay and it did turn on (as did the cooling fans in a couple minutes) So power doesn't seem to be the issue."

I want to check my compressor, and I was told that if I connect a 12 volt wire and a ground to the plug in connector on the compressor then I should here a click and that the compressor should be OK. Does this sound right?
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post #6 of 10 (permalink) Old 08-07-2009, 12:52 PM Thread Starter
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Yeah I switched the realys around a few times. The're all good.

Hi Michb062

What I mean by doing a jump is when I take the compressor relay out and use a small pc of wire to bypass the relay function. (just to see if in fact there is power to the compressor) Stick one end of the wire in the bottom slot and the other right above it in the middle slot of the relay port. (so to speak)

Hope I'm explaining myself okay
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post #7 of 10 (permalink) Old 08-07-2009, 01:31 PM
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Yeah I switched the realys around a few times. The're all good.

Hi Michb062

What I mean by doing a jump is when I take the compressor relay out and use a small pc of wire to bypass the relay function. (just to see if in fact there is power to the compressor) Stick one end of the wire in the bottom slot and the other right above it in the middle slot of the relay port. (so to speak)

Hope I'm explaining myself okay
OK, I understand what your saying, but could you do like I suggested?
(Disconnect the power and then run a 12 volt and ground wires to the pins inside the plugin?)
You would here a click of the magnets pulling. If this happens then you would know that at least the clutch is working.
Would this work?
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post #8 of 10 (permalink) Old 08-07-2009, 01:43 PM Thread Starter
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I don't know. I do know that without the engine running if you wire the relay you hear the magnets pulling.
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post #9 of 10 (permalink) Old 08-07-2009, 01:48 PM
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I don't know. I do know that without the engine running if you wire the relay you hear the magnets pulling.
Yeah it sounds like we are doing the same thing just in a different way.
My way, I can do it on the bench.
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post #10 of 10 (permalink) Old 08-10-2009, 11:10 PM
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Honestly, it sounds like the transducer... It could be you are under charged... I haven't looked at a gauged with it plugged in for a while, so I don't know what pressure you should be running (I'm no AC expert, but can get it done). So, in these cases, I have had to put a bit more freon in it.

I have also read that debris can get down in the small tube that the transducer is attached to. I pulled my schrader valve out and replaced it with a new AC rated one... then re-installed and re-charged... Worth a shot if you reach your wit's end.
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