Climate Control Always Going To Outside Air

[dcovell]

If I have the climate control on auto then it will kick on the fan full blast and cool everything down, it then gets to a point where is switches to outside air by itself. Very annoying as I do not want it to do that. So I press the recirc button and it stays on that until I turn the truck off and back on again.

 

So I stopped using the auto mode and control the fan manually but it still switches to the outside air by itself. I almost never want the outside air as we have a lot of cars from Mexico that smell really bad due to low quality gas, poor maintenance, and little to no smog regulations. Also diesel trucks, agriculture, etc.

 

I understand that you should not keep it on recirculate all the time as moisture can build up and cause mildew but this is very annoying and I want to know if there is a way to program or do something difference than what I am doing to have it stop changing the air source on me.

[ujtruck]

Well I have the same issue I don't think we can program AC Buttons. Did you try calling ON Star...?

[dcovell]

What would OnStar have to do with that? I didn't think they were tech support. My guess would be the same as yours, that it can't be changed, live with it.

[omegafiler]

That's pretty much how all the GM auto AC units I've seen function. Just sorta does whatever it wants. If anybody has a way to change that, I'd be interested to know.