# 2009 GMC Envoy AC column

**URL:** <https://community.cartalk.com/t/2009-gmc-envoy-ac-column/136153>\
**Category:** The Show\
**Created:** [March 9, 2019, 7:26pm UTC](https://community.cartalk.com/t/2009-gmc-envoy-ac-column/136153 "2019-03-09T19:26:57Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![RonWolf](https://avatars.discourse-cdn.com/v4/letter/r/9fc348/32.png) [@RonWolf](https://community.cartalk.com/u/RonWolf)\
**Post date:** [March 9, 2019, 7:26pm UTC](https://community.cartalk.com/t/2009-gmc-envoy-ac-column/136153/1 "2019-03-09T19:26:57Z")

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Not a question, but a comment on your recent article about a guy with a GMC Envoy with a/c cycling from normal operation to poor operation with fog coming out the vents and then recovering to normal operation after being shut down for awhile. That sounds exactly like a low refrigerant problem. The evaporator super cools due to very low pressure from a low refrigerant level causing icing on the coils which restricts the air movement. Then after sitting for 15-20 minutes the ice melts and the a/c appears to work normally again. I’ve personally experienced this years ago