1990 Chevrolet Truck

My pickup is a standard, and has given me very little trouble. The past few days I have noticed a 'whirring' noise like a loose fan belt, and if I come to a stop while running the air conditioner the pickup dies---it will start right back up which is great, but being a single female I do not want stranded so could you tell me what I might check----local mechanics can not always be trusted to do just what is needed so I need a heads up on what might be wrong. Thanks for your help
May 30, 2006.

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