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A.C. accidental breakage???

 
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Old 08 Aug 2008, 11:24 pm
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Default A.C. accidental breakage???

Hey, I have an '03 touring edition with a bit of a conundrum. Back in late April I was already using the A.C. (yes contrary to what many believe MN does get pretty warm) about a week later I had my head gasket replaced. then when I got the car back, the A.C. did not work. The mechanic that worked on my car insisted he did not touch the A.C. system to do the head gasket, also he does not service A.C. systems because he knows to little about them, instead, he outsources all A.C. repair to another shop. I noticed that the little black cap on the low side of the A.C. lines was missing (it was there before the job) So I thought he may have bumped a line and let out some refrigerant by accident. I brought the car to a specialist the other day and he stated that the compressor was not hooked up (don't know why I didn't think to look at it) and that the electrical connector to it had been broken. he also added a little refrigerant to the system. He then jerry rigged the connector to see if the compressor was bad. Now the car stumbles badly at idle and surges while driving with the A.C. on, and the compressor cycles on and off very rapidly. I brought it back to the mechanic that did my head gasket and told him to fix it, but he couldn't figure out what the problem was and told me that he didn't touch the area where the compressor was when he was doing the head gasket. he then called up the shop that all A.C. repairs are outsourced to and asked the guy there what he thought. The A.C. repairman said that a line or filter may be clogged.

Does anybody have any idea what is going on here? Any suggestions on what I should do?
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Old 09 Aug 2008, 06:45 am
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Default Re: A.C. accidental breakage???

Start with fixing the AC. Found this.........

There are PRESSURE SENSORS within the A/C lines that when a leak develops these sensors will either cycle the compressor rapidly and or when the freon gets low enough will STOP the compressor from engaging totally.

Within the A/C system there is approx 7 ounces of refrigerant oil and when a leak develops not only do you lose freon you also lose refrigerant oil. These sensors prevent the compressor from being damaged due to lack of refrigerant oil.

SLIGHT leaks usually do not require any additional replacement of refrigerant oil, but a major leak such as a blown A/C hose can cause 50 to 80% of refrigerant oil loss, thus the reason for these pressure sensors.

Your problem due to the rapid ON-OFF cycling implies that you most likely have a SMALL leak and eventually over time the compressor will cease to engage once ALL the freon is lost from the system.
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Old 09 Aug 2008, 10:08 am
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Default Re: A.C. accidental breakage???

When he did the head gasket he broke the connector on the compressor. I know this for a fact because I did it when I did my first timing belt on a PT. I was fortunate that I was able to repair it though. He had to jack the engine way up to get the motor mount off the front of the engine and when he did that the connector for the compressor hit the fan shroud and broke.
As for the stumbling. More than likely the radiator fan is not working so when you sit at idle the compressor builds up high pressure and causes the stumble. The fan is a very common thing to go bad. Did it overheat and that's why you had to have a head gasket?
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Old 11 Aug 2008, 01:28 am
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Default Re: A.C. accidental breakage???

Yes the car was overheating, but the radiator fan worked, and the thermostat was replaced, and since the head gasket repair I have had no problems with it overheating. What fan are you talking about that would cause more pressure inside the A.C.system. The car also loses a lot of power while I'm driving...well, more so that usual. lol.
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Old 11 Aug 2008, 09:27 am
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Default Re: A.C. accidental breakage???

The radiator fan runs at 2 speeds. Typically the high speed goes bad. The brushes wear out and the fan quits running. As for the power loss.... don't know for sure.
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Old 13 Aug 2008, 03:05 am
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Default Re: A.C. accidental breakage???

OK, so here is the latest update. I have two leaks, one in the "suction line" the rubber hose attached to the compressor, and what appears to be a burst valve on the bottom of the compressor. They told me I needed a new compressor, and that a piece of the pressure switch may have broken off inside the compressor and trashed it, is that a possibility??? if so then I get a new compressor out of this whole ordeal.
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Old 13 Aug 2008, 08:05 pm
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Default Re: A.C. accidental breakage???

The valve is not busted. There is a high pressure relief valve on the bottom of the compressor. When head pressure gets to high that valve vents the excess pressure. That is a bad thing but it keeps the system from blowing up. I am willing to bet 5 bucks that the radiator fan is bad. I see this VERY often. I work on these for a living, trust me. The hose needs to be replaced and the radiator fan needs to be replaced. The rapid cycling is from low freon. I'll bet dollars to doughnuts that the compressor is just fine. Replace the line, fan and recharge the system. One last thing. Is the compressor still jury rigged? If so it needs to be unjury rigged.
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Old 14 Aug 2008, 03:13 am
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Default Re: A.C. accidental breakage???

So how can I test both fan Speeds? I believe low still works.
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Old 14 Aug 2008, 07:10 am
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Default Re: A.C. accidental breakage???

You would need a scan tool capable of activating both speed of the fan. You could also rig a setup to apply power directly to the fan. If I remember correctly there are 3 wires going into the motor. One ground and 2 power wires. One is low speed and the other is high speed. You'll have to go underneath the car to test it.
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Old 15 Aug 2008, 04:10 am
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Default Re: A.C. accidental breakage???

one last question, how would I go about testing the relays?
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