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Message: <blockquote data-quote="philipxhuff" data-source="post: 1343606" data-attributes="member: 11203">It Sounds like you have an over pressure problem. If the ac system has had work on it and been open with oklahomas high humidity it can get moisture in the system and work fine until it expands the moisture through the expansion valve and high side pressure can shoot up and kick the compressor off until pressure drops and it will repeat. Adding freon will make it worse. Best thing is to put the system in a vacuum for at least 30 or down to 250microns to get the moisture out. Closest to 100% freon. Also I've seen idle air control valves go bad and it can't raise the idle when the compressor kicks on so instead of stalling the engine it will shut the compressor off. It would prolly have a check engine light on for that. Of coarse it could be condensor/ radiator fan not cooling. Or clogged condensor. But most likely moisture in the system.</blockquote>