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AZTechBrian, ASE Certified Technician
Category: Chevy
Satisfied Customers: 708
Experience:  Owner
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I have a 2011 Chevy Express and the AC all of a sudden

Customer Question

I have a 2011 Chevy Express and the AC all of a sudden stopped blowing in the front vents. It blows out of the rear, floor and defrost vents but not the front. From what I can read it sounds like I need to replace the actuator. I can't find where its located. It looks like on similar trucks its above the gas pedal, but its not there on the van.
Thanks for any help you can give me.
Submitted: 9 months ago.
Category: Chevy
Expert:  Cary York replied 9 months ago.

Hi, I’m Cary and I’ll be helping you today.
Please understand that I can't smell, hear, or touch the vehicle either, so patience is appreciated. I work part-time here on JustAnswer to help you and others repair their own vehicles, and I get credited by your ratings. So before leaving the site make sure and leave me a rating. You can still reply to me as many times as needed, even after the rating..

Looking for repair info. I'll be right back.

Expert:  Cary York replied 9 months ago.

The mode doors in the front HVAC system are vacuum operated. I would suspect a vacuum leak first. Here is a description of operation.

Expert:  Cary York replied 9 months ago.

It also has a vacuum pump that supplies vacuum to the vacuum reservoir for the HVAC system. That could also be the problem. Let me know if you want to try and fix yourself and need more info. If you rate me now we can still keep this discussion going.

Customer: replied 9 months ago.
I don't even know where to look for the tubing to check for leaks
Expert:  Cary York replied 9 months ago.

I do not have a clear diagram of the vacuum routings but I would start by making sure the pump is running and if it is, start from there and inspect vacuum hoses.

Customer: replied 8 months ago.
Cary, I need more need more detail than this. I don't know where the pump is. Please provide a diagram that you can use to show me where to look.
Expert:  AZTechBrian replied 8 months ago.

Hello. I will try to help you with this. The pump is accessed by removing the air cleaner assembly. I would suggest removing that, and inspecting all the vacuum lines under the hood. It's very possible that one of the vacuum lines has been damaged, corroded, etc and is not supplying vacuum to the actuator. You can disconnect the vacuum line at the pump and apply vacuum with a hand vacuum pump and see if it works then I will provide you with a picture of the vacuum pump, but none of us will have a diagram of all the vacuum lines with their exact routing. You would have to follow the lines and inspect as you follow. The use of a smoke machine would make that job much easier but smoke machines aren't always easy to come by. If you apply vacuum you may hear the leak. There is also a vacuum reservoir under the battery tray. Inspect the vacuum lines to that as well. After inspecting all the vacuum lines, if you find absolutely nothing wrong with any of them then the air door actuator is accessible by removing the instrument panel carrier. I would start with the pump first and thoroughly inspect all the lines. If you need further help please dont hesitate to let me know