# UnCool At Any Speed

**URL:** <https://community.cartalk.com/t/uncool-at-any-speed/44223>\
**Category:** Maintenance/Repairs\
**Tags:** hummer\
**Created:** [February 10, 2010, 3:14pm UTC](https://community.cartalk.com/t/uncool-at-any-speed/44223 "2010-02-10T15:14:41Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![eruss07404](https://avatars.discourse-cdn.com/v4/letter/e/e68b1a/32.png) [@eruss07404](https://community.cartalk.com/u/eruss07404)\
**Post date:** [February 10, 2010, 3:14pm UTC](https://community.cartalk.com/t/uncool-at-any-speed/44223/1 "2010-02-10T15:14:41Z")

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The air conditioner comes on in my 06 Hummer only after the car goes over 40 mph. I checked all the fuses and diods under the hood and nothing seems wrong.

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**Author:** ![Caddyman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/caddyman/32/23_2.png) [@Caddyman](https://community.cartalk.com/u/Caddyman)\
**Post date:** [February 10, 2010, 4:22pm UTC](https://community.cartalk.com/t/uncool-at-any-speed/44223/2 "2010-02-10T16:22:39Z")

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Since your vehicle is the most uncool thing there is, it is only fitting that the A/C keeps the family tradition alive…I hope, for your sake, that the windows still roll down…

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**Author:** ![oldtimer-11](https://avatars.discourse-cdn.com/v4/letter/o/e79b87/32.png) [@oldtimer-11](https://community.cartalk.com/u/oldtimer-11)\
**Post date:** [February 10, 2010, 4:30pm UTC](https://community.cartalk.com/t/uncool-at-any-speed/44223/3 "2010-02-10T16:30:12Z")

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Just what were you looking for under the hood? Your most likely problem is a low refrigerant charge.

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**Author:** ![cigroller](https://avatars.discourse-cdn.com/v4/letter/c/c68b51/32.png) [@cigroller](https://community.cartalk.com/u/cigroller)\
**Post date:** [February 10, 2010, 5:27pm UTC](https://community.cartalk.com/t/uncool-at-any-speed/44223/4 "2010-02-10T17:27:37Z")

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I’d also ask whether or not you’re confusing the temperature of the air with whether or not the fan is actually blowing it. If your blower fan is not operating, the AC might be cooling, but you won’t get any air flow until the movement of the vehicle forces it through the fresh air intake.