HVAC control issue

SHELBYGT08

MEMBER
2001 BUICK CENTURY
38,000 MILES

HVAC controls got real tight on the AC/heat side selector. Fan side is fine. I broke the knob trying to turn from defrost back to AC. Now it will not move at all even with pliers. When it was working I had no issues with air coming out the proper location. I’m thinking this is a simple HVAC control unit replacement could it be something else?

3 Replies

ASEMASTER6371

MECHANIC
52,797 POSTS

Good evening

Yes, I would replace the control head. It sounds like it has failed.

Rock auto has the part. I attached a picture for you.

Procedures below for you.

Roy

1. Remove the instrument panel accessory trim plate.
2. Remove the front floor console, if equipped.
3. Remove the retaining screws from the HVAC control module.
4. Pull the HVAC control module out from the instrument panel.

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5. Disconnect the electrical connectors and the vacuum harness, if equipped from the HVAC control module.
6. Remove the HVAC control module.

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Monday, July 22nd, 2019 AT 5:24 PM

SHELBYGT08

MEMBER
11 POSTS

I was gonna take the hvac control unit out but before I did I pulled the other knob off to see if the other side was still tight and it was smooth as it should be I tested all the functions everything is working fine kinda weird if you ask me so I Epoxied the busted knob together drove the car tested the function of the unit several times it’s all good again. Have you ever heard of this happening?

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Monday, July 22nd, 2019 AT 7:14 PM

ASEMASTER6371