82 AC system??
Thread Starter
Melting Slicks
Joined: Jun 2011
Posts: 2,096
Likes: 15
82 AC system??
Well today I decided to charge my ac system on my 82. Bought one of those AC Pro pull the trigger and watch the needle deals which did work but have a couple of questions. How can you tell the high pressure switch is bad? Because after the compressor is running for about 20 seconds it starts to turn on and off like you're flipping a light switch as fast as you can. When I jumper from the high press. switch to the compressor it runs fine and it actually puts out not ice cold air but pretty cold. Then next question when I had compressor out of the car I plugged the holes on both the compressor and the lines and did not tip it over so no oil would rub out. Thinking there was enough oil in there when the compressor was running it was very hot to the touch and sounded like rocks rolling around in there so I went to Advance Auto Parts and bought APG 150 oil and added the 3 oz. but didn't make a difference on the sound. So can anyone help here?
Thanks
Thanks
Race Director
Joined: May 2006
Posts: 18,665
Likes: 2,564
This link is a generic explanation of how to test the high pressure sensor
http://www.youtube.com/watch?v=JXWqWt1qotg
Since you state you removed the compressor, did you evacuate the system before recharging?
http://www.youtube.com/watch?v=JXWqWt1qotg
Since you state you removed the compressor, did you evacuate the system before recharging?
Thread Starter
Melting Slicks
Joined: Jun 2011
Posts: 2,096
Likes: 15
This link is a generic explanation of how to test the high pressure sensor
http://www.youtube.com/watch?v=JXWqWt1qotg
Since you state you removed the compressor, did you evacuate the system before recharging?
http://www.youtube.com/watch?v=JXWqWt1qotg
Since you state you removed the compressor, did you evacuate the system before recharging?
Burning Brakes
Joined: May 2008
Posts: 1,116
Likes: 5
From: Middleburg Florida
These compressors don't like too much oil. It's almost as bad as no oil and will effect the cooling capability. Did the trigger thing have oil in it too? Have you replaced the dryer? One thing I've learned is the condensors in the older cars are serial flow, meaining it's one long tube bent many times and the air flows in what's essentially a straight line. If there's any kind of blockage, your cooling is effected. You can replace these relatively inexpensively (I've seen them for less than $75) with a parallel flow condensor which is supposed to greatly improve efficiency. I'll be doing that to mine soon...
Le Mans Master
Joined: Apr 2011
Posts: 6,284
Likes: 1,170
From: Hermosa
APG 150 oil and added the 3 oz. but didn't make a difference on the sound. So can anyone help here?
I'm guessing that this was an R-12 system converted to 134A. If that is the case and you don't know if all the mineral oil was flushed from the system the PAG oil could cause problems with the residual mineral oil and ultimately cause compressor failure. You would be better off adding Ester oil which is compatible with both Pag and mineral.
Not evacuating the system may or may not cause you an issue.
Definitely better to evacuate, not doing it will at least cause some loss of effiency.
