a4quattrojon

Alright guys, heres my problem.. i got no heat threw my passenger or driver side vents. and its luke warm through my center vents, window vents and cooler air down to the floors. i have done-

-Flushed Heater Core 2 Times
-Flushed coolant system
-Checked for leaks
-Checked heater core hoses
-Pulled Blower motor and felt heater core its hot

Temp here is about 10 degrees. its sucks.. i am at witts end trying to figure it out. anyone know how to get to the air mix door? i have hvac codes as well ill post them soon if needed

Bruch

There is a blend door that may be causing your problems. Sorry I can't be more specific, but I can only tell you that it exists and you might be able to use VAG-Com to tell if it is moving properly. I have not had any trouble with my Audi heater, but on other vehicles the blend door routes the air either acrross the AC evap or heater core.

Dave

a4quattrojon

so i should be looking for it after the heater core roughly? ugh i know how sucky of a job this is gonna be..

M3Armand

When you say you flushed the heater core, it's a "reverse" flush, right? i.e. - you forced the water through it OPPOSITE of what the normal coolant flow would be? This does the trick for my car each time.

Erick M

Im having the same issue, flushed twice, all hoses are good, hot where they are supposed to be, but I don't know where the blend door is?

clancy

This may not be your issue, but read this thread.
https://www.audiworld.com/forums/a4-...2860332/page2/
It is the cause for many with no/low heat in cabin.