The air blows out of the defrost in the dash. A/C control module? How do I fix this? Thank you for any help.
Aug 21, 2022 at 8:51 PM
The air conditioner is stuck in defrost mode, how to repair this?
1991 GMC C1500
PCAMPBELL50
- MEMBER
- 1 POST
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JACOBANDNICKOLAS
- ✓ASE Certified Mechanic
- 110,194 POSTS
Hi,
It sounds like an issue with the mode door actuator. That is what is responsible for airflow direction.
To get you started, take a look through this link. It explains in detail what is the most likely cause of this condition.
https://www.2carpros.com/articles/air-vents-stay-in-the-defrost-position
If you look below, I included the directions for replacing the actuator. What I would recommend is to first remove it and while it is still connected, see if it responds when you change the airflow direction. On the other hand, if you hear a clicking sound when trying to change the direction, chances are there is a plastic gear in the actuator that has been stripped.
Let me know if this helps or if you have other questions.
Take care,
Joe
See pics below.
It sounds like an issue with the mode door actuator. That is what is responsible for airflow direction.
To get you started, take a look through this link. It explains in detail what is the most likely cause of this condition.
https://www.2carpros.com/articles/air-vents-stay-in-the-defrost-position
If you look below, I included the directions for replacing the actuator. What I would recommend is to first remove it and while it is still connected, see if it responds when you change the airflow direction. On the other hand, if you hear a clicking sound when trying to change the direction, chances are there is a plastic gear in the actuator that has been stripped.
Let me know if this helps or if you have other questions.
Take care,
Joe
See pics below.
Images (Click to enlarge)
Professional Diagram for 2CarPros Members
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Professional Diagram for 2CarPros Members
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Aug 21, 2022 at 9:24 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.