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Q:

air conditioner quit; compressor grinds when turned on on 1998 Toyota 4Runner

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Air conditioner was running fine on a 90 degree day. Then, no cold air. Smoking from fan belt area under the hood. Smoke stopped when AC turned off. Nw just a grinding sound whenever the AC is turned on. No cool air.
(1) Answer
Your compressor or compressor clutch is seizing up and will likely need replacement if found to be the issue.