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

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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
(1) Answer
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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