The pulley on the compressor is always running when your engine is running, but the only time
it compresses the freon is when the clutch engages, if the compressor's pulley was not turning,
it would have already snapped a fan belt or your serpentine belt. voltage runs from your fuse box
thru your air condition switch on your dashboard to a low pressure switch that is located at the
accumulator a long cylinder,close to the firewall under the hood or close to the condensor, front
of the car. the switch detects freon pressure in the accumulator, if there is freon pressure, the switch
will stay closed and allow voltage to go to the compressor clutch to engage it and compress the freon,
if there is no freon pressure the switch will open, and there will be no voltage to air compressor, its a
saftey switch to keep your compressor from getting damaged.its possible that the switch could be bad
it may not have voltage at the switch, or it may be open because there is insufficient freon pressure.
check and make sure there is freon in the system.check for voltage at the low pressure switch if you have freon in your system and voltage at the pressure switch, set your ac on high, pull the molex off
the switch, and jump it out with a jumper wire, if the clutch engages and your car starts to cool, just
replace the switch. if the clutch engages but does not cool, then your ac system has some blockage
in the lines. if the clutch does not engage at all then it would be the compressor clutch. good luck!
Will the pressure on the low pressure side of the air compressor be HIGH if the switch is faulty. I have been told 2 things, that the AC compressor is not getting and voltage and that the pressure on the low pressue side is too high. One guy (not a mechanic who knows enough to fix the problem) says he thought the seals on the compressor might be blown. New compressor? How much does that cost. PS I have a 2001 PT Cruiser with 104,000 miles on it.
If the low side manifold reading is high its a sign of a bad switch,or low freon,the switch can be easily checked with a test light set your ac on high, you will get voltage on one side, if the switch is good you will get voltage on the other side. good luck!
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