Air conditioner

Tiny
DMARCO70
  • MEMBER
  • 2000 CHEVROLET CAVALIER
  • 4 CYL
  • FWD
  • MANUAL
  • 245,000 MILES
Air conditioner high pressures when trying to charge it. I have replaced every part of the air conditioning system, some several times, but it still high pressures. The last time it was checked, the compressor wouldn't come on but the mechanic straight wired it to get it to run but it still high pressured when trying to charge it. Any ideas of what the problem may be?
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Thursday, August 11th, 2011 AT 5:27 AM

9 Replies

Tiny
MHPAUTOS
  • EXPERT
Have you added the correct amount of refregrant? To muck will give a high pressure reading.
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Thursday, August 11th, 2011 AT 8:07 AM
Tiny
DMARCO70
  • MEMBER
It won't take any refrigerant, it high pressures every time we start trying to fill it. All refrigerant was removed every time a new part was put on and although it never would take any refrigerant, the line was drained every time before trying to put refrigerant in and it still high pressured as soon as we began trying to fill it.
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Thursday, August 11th, 2011 AT 9:05 AM
Tiny
WRENCHTECH
  • EXPERT
You really need to start all over with a technician that actually has knowledge of A/C systems. Direct wiring a compressor indicates severe incompetence on the techs part. The system first needs to be totally evacuated and recharged with the correct amount of refrigerant and then analyzed as to what the problem may be using professional pressure gauges and a wiring diagram.
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Thursday, August 11th, 2011 AT 10:13 AM
Tiny
DMARCO70
  • MEMBER
Thanks. The system was totally evacuated by a technician who has knowledge of A/C systems, using a professional a/c charging unit and it will not take any amount of refrigerant because as soon as you start to add refrigerant, it high pressures. The only reason it was direct wired for a short time was to see if that was the reason it wasn't taking refrigerant but it didn't solve the problem. I have read on here that if it doesn't have the proper amount of refrigerant, then the compressor won't run so since it had no refrigerant at all, that is why it wouldn't run.
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Thursday, August 11th, 2011 AT 12:53 PM
Tiny
WRENCHTECH
  • EXPERT
There are numerous reasons for high pressure like no cooling fan, bad condenser or a restriction in the system. The technician needs to determine what is causing yours.
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Thursday, August 11th, 2011 AT 1:08 PM
Tiny
DMARCO70
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Thanks. That's what we can't figure out and actually has 3 technicians scratching their heads because it seems as though the system is plugged but, every part of the a/c system has been replaced, some parts 2-3 times. The cooling fan works fine.
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Thursday, August 11th, 2011 AT 1:15 PM
Tiny
WRENCHTECH
  • EXPERT
Don't overlook the discharge hose. They have been known to flap internally.
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Thursday, August 11th, 2011 AT 1:26 PM
Tiny
DMARCO70
  • MEMBER
Thank you very much for all of your help :) I'm not sure what discharge hose you're talking about but, we replaced the 2 hoses that are on the a/c system.
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Thursday, August 11th, 2011 AT 1:29 PM
Tiny
DMARCO70
  • MEMBER
Just spoke with the mechanic who did all the work on the a/c and he said the discharge hose is the only part of the system he didn't replace. Thank you so much for the tip. I'm going to guess that most likely could be the problem.
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Thursday, August 11th, 2011 AT 1:38 PM

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