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Step one is with the engine turned off, manually turn the center of the AC compressor clutch, it should turn reasonably free, if you can't turn it at all, the compressor is siezed and its time for a new one.
On a 92, you have two choices. Start the car and turn on the AC switch. Unplug the connector from the cycle switch on the accumulator... the aluminum can with AC lines going to it at the passenger side of the firewall. Then bend up a paper clip so it fits between both pins in the connector on the harness you just unplugged. You should hear a click from the compressor clutch and the center of the AC clutch should now be turning. If the AC starts cooling with the interior fan running, you have a bad cycle switch. Unscrew it from the accumulator and screw on a new one... there is a valve behind the switch so you won't have to recharge the system. If it does not cool, the system has lost coolant via a leak somewhere, charge and add leak detector.
The second choice for engaging the compressor clutch is to unplug the one wire that runs to the AC compressor and put a jumper between it and the positive terminal of the battery. The AC clutch should engage and the center of the shaft should start to turn, if not it could be a bad ground wire or a bad AC clutch. If it does engage and the AC does not blow cold inside the car, you have a refrigerant leak... same process as with the first approach, recharge with refrigerant and leak dye.
Let us know what you find!
jorrell
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92 245 291K miles, IPD'd to the hilt, 06 XC70, 00 Eclipse custom Turbo setup...currently taking names and kicking reputations!
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