# HVAC, some days it works fine others not at all **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** chevrolet, tahoe, airconditioning\ **Created:** [March 22, 2011, 12:43am UTC](https://community.cartalk.com/t/hvac-some-days-it-works-fine-others-not-at-all/62867 "2011-03-22T00:43:39Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![kescott1910](https://avatars.discourse-cdn.com/v4/letter/k/958977/32.png) [@kescott1910](https://community.cartalk.com/u/kescott1910)\ **Post date:** [March 22, 2011, 12:43am UTC](https://community.cartalk.com/t/hvac-some-days-it-works-fine-others-not-at-all/62867/1 "2011-03-22T00:43:39Z")
2004 Chevrolet Tahoe that has the dual climate control features. Some days the A/C blows cold on one side and hot on the other with it set on the coldest setting. Another day it blows cold on both. Then you guessed it a few days later it goes back to blowing hot on one side and cold on the other. Any ideas? ---
**Author:** ![system](https://global.discourse-cdn.com/cartalk/original/3X/1/d/1d47c66a543aa6c5a7873bb2320858f978ff52ed.png) [@system](https://community.cartalk.com/u/system)\ **Post date:** [March 22, 2011, 1:03am UTC](https://community.cartalk.com/t/hvac-some-days-it-works-fine-others-not-at-all/62867/2 "2011-03-22T01:03:05Z")
Have it serviced. Sometimes A/C problems can be cured with the proper level of refrigerant. Or you can go to the parts store and get an R-134A charge kit and do it yourself. If you choose the kit make sure you get one with the gauge so you don’t overcharge the system. ---
**Author:** ![TXdealer](https://avatars.discourse-cdn.com/v4/letter/t/50afbb/32.png) [@TXdealer](https://community.cartalk.com/u/TXdealer)\ **Post date:** [March 22, 2011, 1:17am UTC](https://community.cartalk.com/t/hvac-some-days-it-works-fine-others-not-at-all/62867/3 "2011-03-22T01:17:20Z")
Sounds like a bad blend door actuator in the dash. Sometimes disconnecting the battery for a little while will reset them; otherwise it needs to be replaced. The dashboard needs to come out to perform the repair. A GM dealer will have a scan tool that they can use to help diagnose the problem.