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They do this when the unit gets low on refridgerent. Which is r134-a.
Driver's side under the hood in the Black box
ac delco spark plugs are type that originally came with 2003 GMC envoy
The 1997 GMC air conditioning relay switch can be found in the fuse box. The air conditioning relay switch will be in the third column, at the top.
Check the pressure on the low side of your ac it should be between 28 and 38 PSI, you are likely low on refrigerant
The AC evaporator is located in the lower Dash.
In the firewall. Between the engine compartment and the passenger compartment
It is the larger of the 2 aluminum pipes. Both will have a schroder valve and most of the time it will have an L (Low) on top.
low side service port is on the ac line running from the compressor to the evaporator. you will se it from the front of the engine compartment running upward behind the condenser
a starved evaporator.
The evaporator is part of the ac system. It removes heat energy from the air.
The evaporator for a Chevy Corsica can not be unclogged. When it gets blocked, the evaporator can only be replaced.