# 94 Suburban AC intermittent

**URL:** <https://community.cartalk.com/t/94-suburban-ac-intermittent/62892>\
**Category:** Maintenance/Repairs\
**Tags:** suburban, gmc\
**Created:** [March 22, 2011, 8:43pm UTC](https://community.cartalk.com/t/94-suburban-ac-intermittent/62892 "2011-03-22T20:43:05Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Ernest69](https://avatars.discourse-cdn.com/v4/letter/e/b77776/32.png) [@Ernest69](https://community.cartalk.com/u/Ernest69)\
**Post date:** [March 22, 2011, 8:43pm UTC](https://community.cartalk.com/t/94-suburban-ac-intermittent/62892/1 "2011-03-22T20:43:05Z")

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I have a ac compressor that doesn’t work all the time. I have read how voltage or low power can effect this. When mine does not start up, if you tap the end of the compressor with a rubber mallet, it engages and runs fine for an extended period. Am I dealing with a power supply issue, or could this just be a bad ac clutch?

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**Author:** ![realbinky](https://avatars.discourse-cdn.com/v4/letter/r/a87d85/32.png) [@realbinky](https://community.cartalk.com/u/realbinky)\
**Post date:** [March 22, 2011, 8:44pm UTC](https://community.cartalk.com/t/94-suburban-ac-intermittent/62892/2 "2011-03-22T20:44:26Z")

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sounds like clutch to me. Is not belt driven? How would it be a power supply problem?