Question about 1997 Chevrolet Lumina
The lumina uses a compressor mounted "cut out switch." How did you charge your A/C through a HEATER?
Posted on Jul 07, 2011
Your car does not have a low pressure cycling switch because the compressor never cycles, the Lumina model along with many others uses a variable displacement compressor, in this case the V5 (variable, 5 cylinder.) The compressor has a control valve on it that senses low side (suction) pressure. When the suction pressure drops to the set point discharge pressure is routed into the compressor crankcase where it pushes against the backs of the pistons and compresses a spring on the swash plate. Since the pistons are no longer moving all the way down with each stroke the compressor pumps less.
On a vehicle with a properly working variable compressor the clutch engages when you turn on the A/C and never disengages unless you shut the car or A/C off, it also disengages if you go wide open throttle.
Posted on Aug 03, 2011
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Posted on Jan 02, 2017
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