My 2001 chevy Silverado 6L
Dear MW: I have a 2001 Chevy Silverado A/C problem. The
compressor cycles on and off very fast. It does blow cold but not long
enough to cool the cab, inside temp is 120 a/c cools down to 80. System
appears to be full. Can you Help?


MW:
As long as you are SURE that the freon charge is correct (best way to check
is to evacuate, see how much came out, and re-charge with proper amount)
then 1 thing to look for is a problem with the low pressure switch. They have
been known to be faulty and cause the compressor to cycle on and off. The
low pressure switch  screws into the accumulator, and has a 2-wire connector.
The accumulator is the aluminum cylinder with 2 lines attached to it. It is near
the firewall, on the pass. side.
A light tap on the sensor while compressor is on, usually will turn off
compressor and indicate switch needs to be replaced.

                                      
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A/C freon low pressure switch location. This can cause unstable idle and compressor cycle on and off.
1- A/C Accumulator
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