Both me and my dad's cars have this issue. Sometimes when I accelerate hard, the A/C begins blowing hot air even with the system off. When I say blowing, I really mean blowing. It's like it's maxed out heat and fan speed. I don't know anything about A/C systems yet, but I'd guess our servo motors to close the vent systems have failed? It's really annoying, but I usually drive with the windows down so it doesn't always affect me.

A bit more info: the A/C operates normally when I turn it on. I can control fan speed and temperature perfectly fine. Sometimes only the top vents come on (the small ones on either of side of the top of the dash). I can purge the system when this occurs by just turning on the A/C and the air will stop blowing so hard and will reset to whatever temperature I've got selected.

 

Anyone have any ideas?

 

There's a HVAC system check you can do from the center gauge to tell you if something's out of whack.

 

Some info here, either the flap is broken, linkage or the servo is ? 64116910916

https://www.northamericanmotoring.co...r-linkage.html

 

How do I perform the HVAC system check?