Its hot!need a/c
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4th Gear
Joined: Jun 2009
Posts: 4
Likes: 0
Its hot!need a/c
1979 corvette replaced a/c lines. pump, converted t0 134 gas.put in new relay last yr. blower works no cold air, any suggestions? clutches dont seem to be working pump is less than two years old and worked fine before. Need help, its hot, corvettes of carlise just around the corner need air for the trip. SUGGESTIONS APPRECIATED THANKS!!!! tried putting in more freon guage resd full still wont engage clutch any other suggestions??
Last edited by corvette138; Aug 16, 2009 at 09:31 PM.
Drifting
Joined: May 2005
Posts: 1,968
Likes: 44
From: East TN
If you don't run the a/c compressor once in a while during the year and get some oil to the seals, there's a good chance that the gas leaked out due to dry seals which would cause the a/c clutch not to engauge. It may just need to be recharged. 
Burning Brakes
Joined: Jun 2008
Posts: 1,086
Likes: 1
From: Michigan
Use a jumper wire on the pressure switch in the high side line near the compressor to see if the compressor will run.
If the refrigerant is too low in the system this switch will prevent the compressor from running.
I assume you pulled a good vacuum for 1/2 hr to 1 hr and checked to see if it would hold before you put in the refrigerant.
If the refrigerant is too low in the system this switch will prevent the compressor from running.
I assume you pulled a good vacuum for 1/2 hr to 1 hr and checked to see if it would hold before you put in the refrigerant.
Race Director
Joined: Apr 1999
Posts: 11,520
Likes: 13
From: CORVETTE 77 385 C.I. TEXAS
As both said, it's probably low on freon.
This is most likely why it doesn't turn on. The pressure can be checked w/ system off.
I am running R-12 & the expected pressure would be around 100 psi off.
W/ key & A/C on, power to the compressor can be checked.
I am running R-12 & the expected pressure would be around 100 psi off.
W/ key & A/C on, power to the compressor can be checked.
