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there are two pressure switches in an ac system
one switch prevents the compressor from running if there is too much gas
the second is to prevent the compressor from running if there is insufficient gas
from what you describe , one of those switches ( most likely no gas) is the switch
check for oil dust around the fittings , condenser or have an ac specialist check for leaks and regas
Looks like the low pressure switch gets power from a 10amp ac fuse. Power then goes to the ac relay which is powered on by the ac heat controller on the dash. Power then goes thru the high pressure switch to the compressor. The ac relay is grounded to the body. Do you have power on the lite and dark green wires going into the relay and is it grounded ?
The low side pressure switch in the AC low pressure line signals the PCM (computer control) to close the AC compressor relay and raise the idle speed. If the system is low on refrigerant charge the relay will not allow the system to engage the compressor, this is because the oil that lubricates all the works is suspended in the AC refrigerant, if that is low then the system gets no lubrication and will quickly seize up..
If there is no r-12 or freon in the system it wont come on. Try jumping the pressure switch. It's a 2 wire plug somewhere one the AC lines. Just pull it off and jump the wire end with another wire.If the clutch engages you need freon or R-12.
Try checking the spacing of the clutch of the compressor to your A/C...chances are the gap is too large and will not pull down to engage the compressor. That should eliminate the jump wire and keep your car snowing. No clutch to engage the compressor, no A/C.
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