A/C Clutch- Metal Shavings & A Rattle ! - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 03-14-2012, 08:25 AM   #11
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Thanks Mike, Schematic Greatly appreciated!
Unfortunately this could get ugly. Too much in there.
Almost tempted to rig a diode wire set up directly to Coil at clutch with a relay/toggle switch. Is there a way to read the PCM?
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Old 03-14-2012, 08:57 AM   #12
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Read the PCM doing what?
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Old 03-14-2012, 09:25 AM   #13
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To see if signal is making an input of:
AC clutch Request
It also controls signal to relay which had no input at ground.
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Old 03-14-2012, 09:34 AM   #14
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Yes, it is possible to see such requests. I'm not sure which OBD2 tools(such as Actron) that will show that data, but my ScanXl software for laptops can.
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Old 03-14-2012, 10:02 AM   #15
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Just to give you an idea what ScanXL will do, I scanned a printout of my Bonneville using freeze frame data. What the scanner does is, it takes a snapshot of every supported PID and records the data..I scanned the printout into a .pdf file. Take a look. The first page shows the A/C values...

http://www.kc2jga.com/scandata.pdf
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Old 03-14-2012, 01:58 PM   #16
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10-4 Mike That is what we're talking about. Even though I do not have the software, apparently the AC guy does. He already had the schematic out when I pulled in this AM.
I bought him lunch just for his time and energy as he has not charged me anything.
He will scan it, but I am of the opinion that I do not like way this compressor likes to run all the time. He will install a illuminated toggle/relay/fuse directly to coil on AC and that will give me complete control then. Chasing the system could only add up to possibly more expenses and still have further problems down the road. The Schematic diagram from the PArk Ave is too complex. (actually ridiculous)
All of the heat/vent door actuators now work in this ride. Time for manual control of the AC without disturbing the whole system again. Will see what he comes up with from the scan though ..time will tell what ends up happening. Next week sometime it goes in.
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Old 03-14-2012, 02:21 PM   #17
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I could be wrong, but if the compressor is continualy running, then either the pressure switch is bad, or you may not have enough refrigerant in the system. Its the pressure switch that tells the PCM Hey, my pressure is too high, shut me off.
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Old 03-15-2012, 08:06 AM   #18
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bypassing the safeties is not a good idea they are there for a reason. assuming the ac guy knows what hes doing and put a gauge on to see if there is pressure in the system, the pressure switch must be bad telling the system theres not enough or too much if it reads actual pressure. it does seem overly complicated though.

the auto control on my bonnie defalts the ac on you have to push the ac button each time if you want to keep it off, i havent seen the buick but i would assume similar.
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Old 03-15-2012, 08:23 AM   #19
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Justin is right. Bypassing the safety pressure switches is not a good idea. Your mechanic needs to find out if the PCM is truely getting a A/C request and go from there. The A/C system believe it or not, is a simple circuit design. Your HVAC controller is a different story because its all electronic.

Justin, the HVAC controls may look different between platforms, but operation and schematics are the same.
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Old 03-15-2012, 01:51 PM   #20
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Ya Justin & Mike this system is not the easiest to diagnose.
I agree that we have to look at live data and see if the PCM is getting a request and then try to figure out why it is not.
It started working again today but, we discovered that the compressor was engaging in most modes BUT....
When it was in defrost mode...and you hit VENT button..it would not switch to Vent from Defrost position. The only way to go to Vent is from off position then go to Vent.
Then he says you probably need a new Climate control and I said ya but what else is causing this compressor not to work when requested???

This climate control unit my cost is $658 plus 12 % tax.
Is there an aftermarkert or rebuilt available anywhere?? This really is no fun.
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