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Passenger side A/C blowing hot air

Tiny
KAILYN60
  • MEMBER
  • 2006 CHEVROLET TRAILBLAZER
  • 2WD
  • AUTOMATIC
  • 160,000 MILES
I had the check engine light read at AutoZone all they would say is to change the thermostat. I also had the battery and alternator tested they said the battery was bad but that they believe it is the fan clutch. I changed the battery but the problem is still there. When I come to a stop the battery gauge is fluctuating down and rpm's jump a little it is loud and rough. Once you start going it drives fine. When turning on the AC it becomes worse. And after changing the battery my AC will only blow cold air on the driver side the back and passenger is blowing hot. If it was the fan clutch would that code show up? Could this be just the thermostat? And what is going on with the AC? Please help.
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Monday, May 20th, 2019 AT 9:49 AM

3 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
It sounds like the HVAC system lost its calibration. Please remove the HVAC1 and HVAC8 fuses in the rear fuse block below the left rear seat. And turn the key on for two minutes, then turn the key off and replace the fuses then start the car and let sit for two more minutes and you should be all set. Let me know what happens.
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Tuesday, May 21st, 2019 AT 2:35 PM
Tiny
KAILYN60
  • MEMBER
  • 2 POSTS
Thank you! I ended up having to take it to a mechanic. You are correct about the AC needing to be reset. Also my thermostat is stuck open so that will be changed! Thanks for your help!
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Tuesday, May 21st, 2019 AT 4:17 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Good to hear, please use 2CarPros anytime we are here to help.
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Thursday, May 23rd, 2019 AT 10:51 AM

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