A/C PROBLEM, ANY A/C EXPERTS IN HERE?
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Laughing Gas
Joined: Feb 2011
Posts: 1,147
Likes: 6
From: Vine Grove KY
A/C PROBLEM, ANY A/C EXPERTS IN HERE?
Guys, Gary Lewis and I tried recharging my a/c system last year and failed. At that time I put a new compressor in it, new orifice, and we pulled a vacuum. It held vacuum. (we also replaced o-rings). We were not able to get the system to operate. We would put freon in after pulling a vacuum on it and the compressor would kick on. Looking at the gauges ive discovered that the low pressure side is way too high and the compressor is making alot of noise. No cold air...
fast forward a year to last night. I took the system apart. Ran denatured alcohol through the entire system except the compressor and dryer. I blew it all out with an air hose. There was ALOT of dye and oil that came out. So I thought that maybe the system had too much oil in it last year. So at this point I thought I had it figured out. I pulled a vacuum on it all night last night, woke up and watch the vacuum to see if it bled off. It remained steady. So I continued to add freon. It took about 2.5 12oz cans and the low pressure side read WAY too high again just like last year, and the compressor was really loud!
I am now totally frustrated, hot, sweaty and about to give up. Can anyone please make any suggestions???
fast forward a year to last night. I took the system apart. Ran denatured alcohol through the entire system except the compressor and dryer. I blew it all out with an air hose. There was ALOT of dye and oil that came out. So I thought that maybe the system had too much oil in it last year. So at this point I thought I had it figured out. I pulled a vacuum on it all night last night, woke up and watch the vacuum to see if it bled off. It remained steady. So I continued to add freon. It took about 2.5 12oz cans and the low pressure side read WAY too high again just like last year, and the compressor was really loud!
I am now totally frustrated, hot, sweaty and about to give up. Can anyone please make any suggestions???
Thread Starter
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Laughing Gas
Joined: Feb 2011
Posts: 1,147
Likes: 6
From: Vine Grove KY
When starting the engine the compressor kicks on. The high pressure side jumps to 125psi, and the low pressure side is at 85psi. What the crap? It should be much lower than this. Any ideas?
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Laughing Gas
Joined: Feb 2011
Posts: 1,147
Likes: 6
From: Vine Grove KY
Is it possible to overcharge it?
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Laughing Gas
Joined: Feb 2011
Posts: 1,147
Likes: 6
From: Vine Grove KY
From what I have read online, that may be my issue. or a bad compressor. A clog will cause a low pressure condition on the high side, and a high pressure condition on the low side. Which is what I have. However, I just blew air and denatured alcohol through the entire system and it had no clogs. Which makes me believe it is the compressor.
Fleet Mechanic
Joined: Jun 2010
Posts: 1,251
Likes: 8
From: North Carolina
From what I have read online, that may be my issue. or a bad compressor. A clog will cause a low pressure condition on the high side, and a high pressure condition on the low side. Which is what I have. However, I just blew air and denatured alcohol through the entire system and it had no clogs. Which makes me believe it is the compressor.
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Posting Guru
Joined: Feb 2011
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From: Princeton MN
Also check the orface tube, and make sure its not restricing anything. It may not have been the right way to do it but I kept my old orface tube, and with 134 in my converted r12 system my thermometer in the vent reads 38* with 92* temp outside. My lowside reads steady at around 38psi, the high side if i remember right is around 200.
But I also agree the compressor could have bad valves in it.
But I also agree the compressor could have bad valves in it.
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Thread Starter
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Laughing Gas
Joined: Feb 2011
Posts: 1,147
Likes: 6
From: Vine Grove KY
The compressor had only a 90 day warranty, but I talked to the store manager and because I have thousands of transactions with them they decided to give me a new one. So, I am going to pull the orifice tube back out, and make sure its in good shape. I will put everything back together and pull a vacuum on it for a little while and take it somewhere and have them charge it. Im sick and tired of this thing not working. Ive been messing with ac systems for several years and never had I had such a damned hard time on one.
Thread Starter
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Laughing Gas
Joined: Feb 2011
Posts: 1,147
Likes: 6
From: Vine Grove KY
Also check the orface tube, and make sure its not restricing anything. It may not have been the right way to do it but I kept my old orface tube, and with 134 in my converted r12 system my thermometer in the vent reads 38* with 92* temp outside. My lowside reads steady at around 38psi, the high side if i remember right is around 200.
But I also agree the compressor could have bad valves in it.
But I also agree the compressor could have bad valves in it.
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Laughing Gas
Joined: Feb 2011
Posts: 1,147
Likes: 6
From: Vine Grove KY
Ok guys. Autozone replaced the compressor for me. I went ahead and hooked it up. Then I took out the orificae tube just out of curiosity....it was all nasty. Some rusty looking gunk. It had metal shavings in it.....maybe that new compressor I bought last year was bad and it contaminated the system, and clogged the oriface and caused the high-low/ low-high problem.
What I am going to do now is take the truck somewhere to have it professionally cleaned out and charged before I run this new compressor in it and destroy it. I might have them put in a fresh oriface tube to ensure this contaminated one doesn't screw things up.
What I am going to do now is take the truck somewhere to have it professionally cleaned out and charged before I run this new compressor in it and destroy it. I might have them put in a fresh oriface tube to ensure this contaminated one doesn't screw things up.
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Laughing Gas
Joined: Feb 2011
Posts: 1,147
Likes: 6
From: Vine Grove KY
I understand replacing the accumulator/dryer, but why the condenser? Its a tube type and should be able to be cleaned. Thanks alot
Moderator
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From: Virginia
Just like tranny oil coolers, which are very hard to clean out after a tranny grenades and sends junk through them. Most tranny shops won't warrenty their tranny unless a new one is installed or the clean it themselves with their special machine. Same deal as the A/C coil.