1995 Audi 90 V6 12V Heating Core doesnt heat up

[cgharibo]

Hi!

I just replaced a 1995 Audi 90 V6 12V Heating Core and only have heat with RPMs above 2500.

Initially I though it was a blocked heater core but it is not. Two separate heater cores are both not heating the cabin at idle.

What's keeping the heater not working well at idle and how do I fix it?

Thank you!

[PeterS]

likely trapped air...did you use a vacuum-coolant filler like an airlift or just pour in new coolant?
Try raising the front of the car (alot) to see if the system will bleed for you with the engine running.