Cabin air on recirculate when HVAC is off?

[WS6FirebirdTA00]

This feels like a real stupid question, but coming to work in the morning my windows keep fogging up.

 

I normally ride with the AC off if the mornings are cool enough. I turn off the HVAC and I get the front window fogging. I press the recirculate button to get outside air in the cabin, but I don't really feel it flowing.

 

So, question is, with the system off and button pressed to bring in fresh air, is that all you need to do to get fresh air in?

 

In my Acura, if I turn the system off with fresh air on and set to floor vent, it will come through the floor vent. Not sure how the GMC works.

 

Thanks.

[pronstar]

The system really needs the fan running to draw-in outside air.

And running the AC compressor will prevent fogging.


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[WS6FirebirdTA00]

 Thanks. I get that piece, but I feel like it’s just not venting at all. The point I’m trying to get at is when I’m doing 55 mph down the road I don’t feel air flowing through the vents like every other vehicle I’ve ever owned. There should be some sort of air movement I would expect.

[ftwhite]

Here is a hint from the "Get to Know your Silverado" card. I know you mentioned that you turned off the re-circ mode (fresh air), but it also implies that having the AC off will increase humidity. Which makes sense given the tight sealing of modern car cabins for noise, that even "fresh air" mode doesn't have a big hole open up for air to flow through. Given the cabin air filter, the twists and turns in the vents, and the overall poor airflow in Silverado cabins to begin with; with no-AC, I think it is fighting a losing battle with natural humidity (body, breath, etc).

 

 

[WS6FirebirdTA00]

Thanks.

 

Yes, with it off I expect some fresh air coming through the vents. On cool mornings I keep the windows up and that airflow is just enough for me. I don’t need the AC, don’t need the heat.

 

The fact that the airflow seems non-existant is causing the issues. It seems with the system off and setting it to not recirculate, it ignores that command.

[pronstar]

It’s not reverting to recirc when it turns off.

Not a lot of new cars get that system-off airflow that you’re speaking of.


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[WS6FirebirdTA00]

Ok thanks. 

 

I did press recirc with the system off/engine off and heard the actuator move.

 

Maybe GM stopped doing this. I will check one more time tomorrow.

[Centex14]

You could turn the AC on and bump up the temp.


2014 z71 LTZ
Volant Intake
Borla Exhaust
Diablo
Bilstein 5100
Rough Country Level

[WS6FirebirdTA00]

The whole point is I don’t like running the system all time. I just want air to trickle to get some movement.

[pronstar]

The whole point is I don’t like running the system all time. I just want air to trickle to get some movement.

I think we all understand what you want.

But modern cars - especially as we move away from more economical vehicles - generally aren’t designed to do what you’re asking.


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[WS6FirebirdTA00]

Found out how to do it this morning.

 

Turn the system to the right vent setting and fresh air. Turn the system off. Press the recirc button and it works. Fan and AC stay off but opens the fresh air vent.