GT-three

no matter what settings I have on my 964, my heat is always comming out of the vents.I know its a complex HVAC system on these cars but I was wondering if i deleted the aux. heater blower with the cup heater bypass would this solve my problem?just wondering.

Southampton76

Sounds like you have a bad blend motor. I had the opposite problem, always cold, the drivers side blend motor was bad. There is an article to how to fix somewhere on here.

Cheers

Mark

asbi

I had this, it was a failed servo motor in the heater somewhere, job for your specialist I think.....
Cheers,
Kevin.

GT-three

thanks for the replys.but does anyone know about the cup bypass for the aux blower?

dfinnegan

There have been several threads on this topic. Here are a few:

https://rennlist.com/forums/showthre...***+blower+cup
https://rennlist.com/forums/showthre...***+blower+cup
https://rennlist.com/forums/showthre...***+blower+cup
https://rennlist.com/forums/showthre...***+blower+cup
https://rennlist.com/forums/showthre...***+blower+cup

GT-three

THANKS

JasonAndreas

No it won't make a difference, your problem is the servo motor(s) that control the left & right temperature mixing chambers.

GT-three

thank,I just figued that out when i unplugging the rear motor,it didnt make a difference.heat is still comming out of the drivers side and middle vents. kind of annoying now that its 80 deg out

JasonAndreas

You can temporarily "fix" the problem so that you can drive without cooking yourself.