There are two hoses. Supply and return. On T44s the control valve is a white
plastic part with a vacuum line to it, located just behind the engine's head.

The plastic ones break so it may have been replaced with a steel one.

Tony

~ ElektraMan ~ wrote:
> Does anyone know if my Audi 90 should have a heater valve? I can't see that
> it does. If so where is it located? I've followed the heater hose to the
> firewall and there is no valve on the hose. Is this correct? Or am I looking
> in the wrong area? I replaced one in my Audi 100 so I have a general idea
> where it should be but it's not there. Any help would be appreciated.
>
> TIA,
> Steve
>