# A/C blows on floor when I accelerate but only a few times when engine is warming up **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [August 11, 2011, 7:29pm UTC](https://community.cartalk.com/t/a-c-blows-on-floor-when-i-accelerate-but-only-a-few-times-when-engine-is-warming-up/67038 "2011-08-11T19:29:12Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![syllinx](https://avatars.discourse-cdn.com/v4/letter/s/67e7ee/32.png) [@syllinx](https://community.cartalk.com/u/syllinx)\ **Post date:** [August 11, 2011, 7:29pm UTC](https://community.cartalk.com/t/a-c-blows-on-floor-when-i-accelerate-but-only-a-few-times-when-engine-is-warming-up/67038/1 "2011-08-11T19:29:12Z")
When I first start my truck and drive away it will start blowing air out the floor vents. After about 2 minutes of the engine running this never happens again. Could it be the little thing on brake booster that holds vacuum? ---
**Author:** ![Cougar](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cougar/32/21348_2.png) [@Cougar](https://community.cartalk.com/u/Cougar)\ **Post date:** [August 11, 2011, 9:01pm UTC](https://community.cartalk.com/t/a-c-blows-on-floor-when-i-accelerate-but-only-a-few-times-when-engine-is-warming-up/67038/2 "2011-08-11T21:01:03Z")
There may be a vacuum leak causing the trouble. Also check to see if you have a vacuum reservoir that may not be working correctly. ---
**Author:** ![SteveF](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/stevef/32/2_2.png) [@SteveF](https://community.cartalk.com/u/SteveF)\ **Post date:** [August 11, 2011, 10:48pm UTC](https://community.cartalk.com/t/a-c-blows-on-floor-when-i-accelerate-but-only-a-few-times-when-engine-is-warming-up/67038/3 "2011-08-11T22:48:42Z")
Is this a Dodge truck? The folks at Chrysler know about this problem. There is a TSB on it, and the fix is that they insert a valve somewhere. (If it’s not a Dodge, disregard this post.) ---
**Author:** ![syllinx](https://avatars.discourse-cdn.com/v4/letter/s/67e7ee/32.png) [@syllinx](https://community.cartalk.com/u/syllinx)\ **Post date:** [August 11, 2011, 11:55pm UTC](https://community.cartalk.com/t/a-c-blows-on-floor-when-i-accelerate-but-only-a-few-times-when-engine-is-warming-up/67038/4 "2011-08-11T23:55:10Z")
Yep Dodge Dakota. I do notice now that it only seems to occur after sitting over night. But it is a 2k dakota so i know they would charge me for it. ---
**Author:** ![SteveF](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/stevef/32/2_2.png) [@SteveF](https://community.cartalk.com/u/SteveF)\ **Post date:** [August 12, 2011, 12:02am UTC](https://community.cartalk.com/t/a-c-blows-on-floor-when-i-accelerate-but-only-a-few-times-when-engine-is-warming-up/67038/5 "2011-08-12T00:02:05Z")
OK, they’ll charge you for the repair. This seems only reasonable. Since it is not a safety issue or clear defect, there was never a recall. So now you must decide whether to spring for the repair or to just live with this tiny problem. Speak with the Dodge service manager and then make up your mind. ---
**Author:** ![syllinx](https://avatars.discourse-cdn.com/v4/letter/s/67e7ee/32.png) [@syllinx](https://community.cartalk.com/u/syllinx)\ **Post date:** [August 12, 2011, 12:11am UTC](https://community.cartalk.com/t/a-c-blows-on-floor-when-i-accelerate-but-only-a-few-times-when-engine-is-warming-up/67038/6 "2011-08-12T00:11:54Z")
I will try to find a way around it since they rip you off no matter what. Every time I goto a shop they charge me 2-3 hours labor and only work for 1 hour on it. Thanks for the help guys. ---
**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\ **Post date:** [August 12, 2011, 6:07am UTC](https://community.cartalk.com/t/a-c-blows-on-floor-when-i-accelerate-but-only-a-few-times-when-engine-is-warming-up/67038/7 "2011-08-12T06:07:32Z")
A hand vacuum pump would come in handy for testing the check valve or for checking for vacuum leaks. For any more help we’ll need your adress.