2008 a3 2.0 fsi..heater valve??
 

I am new here..is there a heater valve on this 2008 A3?
I looked at HVAC diagrams and asked parts store, no one has given me an answer.

The problem is there is no heat , even though the coolant temp is at normal temp range, after 10 mins of driving; and the heater is not blowing warm air despite 30 mins of driving;
and i assume the heater valve is stuck closed..Air condition is working ok, and flow controls working (ie venting direction is ok)

pls advise..the problem, if heater valve exist where is it , i dont see it at the firewall or near the windshield wiper motor area