Air conditioning question?
Thread Starter
Instructor
Joined: Nov 2000
Posts: 192
Likes: 0
From: Egg Harbor Twp, NJ NJ
Air conditioning question?
My 95 LT1 coupe has been running great. About a month ago an air conditioning problem started. The AC seems to stop when I'm accelerating. As soon as I let up on the gas it starts again. Haven't seen any leaks but no pressure testing has been done.
Anyione have an idea?
Anyione have an idea?
Le Mans Master
Joined: Dec 2000
Posts: 7,839
Likes: 22
From: San Diego, Ca
If it's floored, it's suppose to work that way. If you have a scanner, the a/c request should go from a "Yes" to a "No" at WOT. Signal is from the TPS which should be pegged somewhere above 4 volts. When the PCM gets this voltage, ground is removed from the a/c clutch relay. On lesser vehicles, you can usually feel the a/c kick out.
Thread Starter
Instructor
Joined: Nov 2000
Posts: 192
Likes: 0
From: Egg Harbor Twp, NJ NJ
The air goes away it seems in stages. By that I mean a little throttle seems to decrease the air slightly. Greater acceration stops the air more until it stops completely. Then let up on the gas and the cold air starts to flow again.
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Advanced
Joined: May 2001
Posts: 69
Likes: 0
From: Ida, Michigan, USA
It doesn't really sound like this since it goes out in stages but when a vehicle accelerates the compressor rpm of course increases. The compressor could be cutting out due to high head pressure (ac charge to high) or low suction pressure (if the ac charge is to low). If it is humid the evap core may be freezing (another sign of a low charge) which reduces air flow and cooling. Just a thought.
Le Mans Master
Joined: Dec 2000
Posts: 7,839
Likes: 22
From: San Diego, Ca
High head pressure on a '90 or up should shut it down until power is removed from the control unit; ie, you'll need to disconnect and reconnect the battery to get it running again. This sounds more and more like a loose connection at the low pressure switch if only because I had that problem with my truck and another member had it with his '90. Jumpering the switch harness and taking it for a drive would be the easiest way to confirm or rule it out.
Le Mans Master
Joined: Dec 2000
Posts: 7,839
Likes: 22
From: San Diego, Ca
Just remembered the vacuum tank - thanks brookman! - that's another thing to check - lines (use the diagram on the radiator, but it should run from the intake plenum), check valve (under the fuel rail or engine cover - left side) and then the tank (left headlight well) to make sure it holds 10 inches of vacuum . . . more coffee, need more coffee!
Burning Brakes
Joined: Aug 2002
Posts: 926
Likes: 2
From: chandler az
If I understand the answer he gave to my second question - It sounds like the air is being diverted away from the vents. If the compressor was cutting out - you would be getting an initial rush of warm(er) air rather than a air pressure change from the vents. It wouldn't be very safe - BUT - you can reach down near the gas pedal and see if you feel cold air when you are on the throttle.
