Climate control air flow increases with vehicle speed

[TallGuy]

2020 with auto climate control. The air flow out of the vents increases with vehicle speed or outside wind speed. It’s like a ram air effect, the flow out of the vents is independent of the fan speed. If I turn on recirculate it drops down to where it should be. Anyone else have this happen?

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[Mr._Bill]

I get higher air flow with recirculate off, but always run with it on to minimize intake of outside air. I would imagine at high enough speeds the airflow will exceed the fan setting with recirculate off.

 

[RedOverland]

Ram air increasing with speed is normal and expected with the design of the Jeep body. Sometimes vehicles have a negative pressure at the cowl where the air goes in during development, which is corrected during wind tunnel testing. Image air being sucked out of the HVAC; that would be terrible, and it the HVAC wouldn’t work!

Some vehicles have ram air control with a door at the HVAC inlet. The door position changes based on vehicle speed, pressure sensor, blower motor current, or some other metric developed by the manufacture.
With a Jeep, you just take the top off.

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