Air conditioner problim

Tiny
AHMED KAMAL
  • MEMBER
  • 2000 CHEVROLET BLAZER
  • 4.3L
  • V6
  • 4WD
  • MANUAL
  • 233,000 MILES
When I start the engine I noticed the climate control system seems to be loosing the effect on the air blend passage doors with noisy opening/closing, it starts blowing very cold air then followed with very hot air and so on, but after long driving it comes back to normal. It happens again if I switch off and restart the engine.
Friday, March 4th, 2016 AT 9:51 PM

4 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Is it an automatic temperature control system or manual?
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Saturday, March 5th, 2016 AT 6:25 AM
Tiny
AHMED KAMAL
  • MEMBER
  • 2 POSTS
Yes it is an automatic temperature (climate control system).
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Monday, March 7th, 2016 AT 11:11 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Check fuse #19 labeled RDO battery. It sounds like the module is not retaining memory. It goes through a self test whenever the power is disconnected, but it's not supposed to do it by merely shutting the key off. I'm thinking it may not have any keep alive memory power.
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Monday, March 7th, 2016 AT 11:19 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
It sounds like the blend door actuator is going bad, here is more information on it

https://www.2carpros.com/articles/replace-blend-door-motor

and video

https://www.youtube.com/watch?v=Eqf-H3COtSo

please let me know how it goes
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Friday, March 11th, 2016 AT 8:20 PM

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