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Discussion Starter · #1 ·
Since new, my car has had very weak HVAC airflow in fresh air mode with the fan off. With the dash vents on, you can barely feel any air coming in at all. It goes away completely when you hit the recirc button, so the flapper doors seem to be moving.

Not a big deal; was just wondering if this was normal for the Cruze. I did search the forum and didn't come with much; will check the flapper door operation once I get the car back from its transmission replacement.
 

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Discussion Starter · #5 · (Edited)
Yeah, it's normal. The air is HOT too when it's not really that hot outside.
If the car is not moving for any length of time, the engine bay heats up pronto...and the cowl intake draws the heat right into the car. Best to hit the Recirc button and/or turn on the A/C if traffic isn't moving.

Seems to me that the Ford and GM cars from the '70s and '80s tended to have more effective ventilation than what we have today--back when A/C wasn't on every car, and there wasn't a cabin air filter plugging up the works. The '81 Escort I had delivered a veritable gale of air through its dash vents when the car was up to speed, and there was no fan in that part of the system to help move the air.
 

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Discussion Starter · #7 ·
It's probably due to aerodynamics. The pressure wave that would push air though the vents is reduced. Frankly, I don't expect to get much of anything though the vents if the fan is off - regardless of the make/model/year.
I guess I never considered aerodynamics. Now that you mention it, the older cars I was thinking of that did deliver a lot of ventilation simply via ram air though the cowl weren't very aerodynamic. My old Escort, Reliant, and Toyota trucks all had great ventilation, but also had the aerodynamics of a brick compared to today's cars.

Still, the Cruze has cowl air intakes that are tiny compared to every other car I've owned and that makes me wonder if airflow suffers as a result. One has to crank the fan up to 3 or 4 to keep the car comfortable on a 60 degree F day with the A/C off.

All in all, not a big deal. Glad I have A/C. Driving a Cruze with the rear windows lowered is miserable!
 
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