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Q: a/c blows cold full charge but intermit blows hot and then cold after a few min on 2008 Mercury Sable

a/c blows cold then no cold sets a few min and then will blow cold again ,full charge no pressure reading problems, intermit operation
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The coil on the air conditioning compressor could be intermittently becoming inoperative, the cycle switch could be an issue as well.

I would have a test done focusing on the electrical portion of the system.
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