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Thread: Negative pressure
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05-04-2009, 01:54 PM #1
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Negative pressure
Hi fellows
This is an automotive a/c system:
After charging, a student of mine is reporting negative pressure on low side port (about -27 hg) and about 100 psi high side port. I have literature about diagnostic by pressure but no one of them reports negative pressure cases. What can it be ?
Moises
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05-04-2009, 03:43 PM #2
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Re: Negative pressure
Blocked expansion device, blocked filter-dryer, etc...
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15-04-2009, 07:42 AM #3
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Re: Negative pressure
negative indicates vacuum
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15-04-2009, 11:31 AM #4
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Re: Negative pressure
No gas in system, also the pressure switch has either failed or doesn't exist.
Chillin
IF AT FIRST YOU DON`T SUCCEED.
DESTROY ALL EVIDENCE THAT YOU TRIED!
and go get a cuppa
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20-04-2009, 04:30 PM #5
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Re: Negative pressure
a student of yours?!
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04-05-2009, 12:58 PM #6
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Re: Negative pressure
I agree with nike123, blockage in L/L or TX.
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04-05-2009, 03:48 PM #7
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Re: Negative pressure
I agree with chillin. An automotive system has a low pressure switch which disengages the magnetic clutch on the compressor if/when the pressure is low. It is not possible for the system to run in a vacuum if this circuit is functioning properly.
Last edited by Gary; 04-05-2009 at 03:50 PM.
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