C5 A/C issues
Thread Starter
Cruising
Joined: Apr 2021
Posts: 10
Likes: 0
C5 A/C issues
I changed out the A/C module twice thinking that would fix the air not blowing continuously when on max. If I hit a bump it fluctuates from high to a lower level of air, my mechanics took apart the dash and still can’t find the problem. He changed out the blender door and actuator.. any suggestions?
Tech Contributor
Joined: Jan 2007
Posts: 19,293
Likes: 1,110
From: Dyer, IN
I changed out the A/C module twice thinking that would fix the air not blowing continuously when on max. If I hit a bump it fluctuates from high to a lower level of air, my mechanics took apart the dash and still can’t find the problem. He changed out the blender door and actuator.. any suggestions?
Thread Starter
Cruising
Joined: Apr 2021
Posts: 10
Likes: 0
A/c c5
Correct, I had it sent off to get refurbished and the second one I just bought brand new. After he installed it, I drove it home and sure enough it did the same thing.. I changed out the blower motor once years ago. I wasn’t sure if it might be the seven grounds that the C5 has wasn’t sure if that was causing possibly the issue. my mechanic said there were two codes in each code he cleared, but again it blows normal for a while then it decreases, and when you hit a bump, it will actually start blowing faster.
Tech Contributor
Joined: Jan 2007
Posts: 19,293
Likes: 1,110
From: Dyer, IN
Correct, I had it sent off to get refurbished and the second one I just bought brand new. After he installed it, I drove it home and sure enough it did the same thing.. I changed out the blower motor once years ago. I wasn’t sure if it might be the seven grounds that the C5 has wasn’t sure if that was causing possibly the issue. my mechanic said there were two codes in each code he cleared, but again it blows normal for a while then it decreases, and when you hit a bump, it will actually start blowing faster.
Thread Starter
Cruising
Joined: Apr 2021
Posts: 10
Likes: 0
A/C issue
I spoke with my mechanic and he sent me this.
I believe what's happening is the direction of airflow is moving because of a vacuum issue. The mode door works off of vacuum not electrical power.
I believe what's happening is the direction of airflow is moving because of a vacuum issue. The mode door works off of vacuum not electrical power.
Tech Contributor
Joined: Jan 2007
Posts: 19,293
Likes: 1,110
From: Dyer, IN
Pro
Joined: Dec 2014
Posts: 680
Likes: 272
From: Cincinnati Ohio
If you determine that it is a mode switching issue and not blower motor speed control, there are some excellent threads in the past year that describe how the forum members identified and fixed the vacuum mode change issue.
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