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air in system?

mak11 on Fri September 05, 2008 12:56 PM User is offline

If an ac system has not been properly vacuumed. how will it affect the high and low pressure readings?

HECAT on Fri September 05, 2008 1:50 PM User is offline

Air is a non condensable gas, excessive high pressures, no heat removal, no cooling.


HECAT: You support the Forum when you consider for your a/c parts.


GM Tech on Fri September 05, 2008 2:52 PM User is offline

I've done those studies on a V-5 system (variable sroke pump) with small amounts of air it will artificially raise the suction pressure enough to cause evap freeze-up because pump does not destroke at correct pressure- with no vacuum pulled it will cause high pressure cut-outs and no cooling.

The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

Chick on Fri September 05, 2008 9:08 PM User is offlineView users profile

Also damage to the compressor....

Email: Chick


Freedoms just another word for nothing left to lose

mak11 on Sat September 06, 2008 4:57 PM User is offline

Thank you very much for your replies.

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