# Ac

**URL:** <https://community.cartalk.com/t/ac/5970>\
**Category:** Maintenance/Repairs\
**Created:** [October 15, 2007, 4:56pm UTC](https://community.cartalk.com/t/ac/5970 "2007-10-15T16:56:03Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Michael\_Hayes](https://avatars.discourse-cdn.com/v4/letter/m/ea5d25/32.png) [@Michael\_Hayes](https://community.cartalk.com/u/Michael_Hayes)\
**Post date:** [October 15, 2007, 4:56pm UTC](https://community.cartalk.com/t/ac/5970/1 "2007-10-15T16:56:03Z")

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My sons Cheverlot Avalanche sat for a long time while he is in IRAQ, I took it for a drive and now it has no AC, before it was parked it had very good AC, any ideas?

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**Author:** ![ok4450](https://avatars.discourse-cdn.com/v4/letter/o/e9bcb4/32.png) [@ok4450](https://community.cartalk.com/u/ok4450)\
**Post date:** [October 15, 2007, 6:07pm UTC](https://community.cartalk.com/t/ac/5970/2 "2007-10-15T18:07:39Z")

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What year vehicle? How many miles? Have you checked to see if the compressor is engaging?

If the vehicle is 6 years or whatever old it’s possible that enough refrigerant charge has been lost and this is preventing the low side pressure switch from closing and activating the compressor.

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**Author:** ![Jeffmw05](https://avatars.discourse-cdn.com/v4/letter/j/74df32/32.png) [@Jeffmw05](https://community.cartalk.com/u/Jeffmw05)\
**Post date:** [October 15, 2007, 6:58pm UTC](https://community.cartalk.com/t/ac/5970/3 "2007-10-15T18:58:09Z")

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The system is probably just low on Refrigerant. I’m no expert, but you should be able to hear and even feel the compressor engage when you turn on the a/c. If it is cooling poorly then the system more than likely has a low Freon charge and you should have it recharged by a competant mechanic. Just don’t tell the shop that the truck is low on COOLANT, like my father did. Oops. Good luck.