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When the a/c quits working check to see if there is power at the compressor clutch. If there is the clutch is bad and needs to be replaced. If there is no power to the clutch, check for power at both terminals of the pressure switch mounted on the accumulator(silver can passenger side firewall). If the freon quantity is to spec's the pressure switch will allow current to flow through it and on to the compressor clutch. If there is power on one side of the switch but not the other, remove the connector from the switch and jump the 2 terminals with a piece of heavy wire. The compressor should then run. If it does and your freon level is correct, then the pressure switch is bad. There is a scraeder valve located under the switch so you can unscrew it and replace it without loosing much freon. Do not run the compressor long without the switch working. If the freon level is low, there will be little refrigerant oil circulating through the system and you could burn out the compressor. If there is no power at all at the pressure switch then there is a problem with a fuse, inside wiring, the manual climate control ECU, or a combination of the above. I have read that the ECU in these cars is known for poor solder joints on the circuit board. This may be your problem, but check out the above suggestions first and let us know what you find.
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