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There is a preset sequence for activation of pump. I believe it to be 45 seconds after ignition is turned off and again around 1 hour. These are set to purge the system and then recharge it. Why it does this I'm not sure but this is what was explained to me by dealer. Hope this helps.

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โˆ™ 2006-05-06 07:34:26
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Q: Why does air compressor make noise when car is off on 1996 Lincoln?
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