Air conditioner problim

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.

4 Replies

WRENCHTECH

MECHANIC
20,758 POSTS

Is it an automatic temperature control system or manual?

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Saturday, March 5th, 2016 AT 6:25 AM

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

WRENCHTECH

MECHANIC
20,758 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

KEN L

MASTER CERTIFIED MECHANIC
47,279 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