2005 A4 1.8T Cab heater problem

[b1llyf1sh]

Hi.
The heater in my 05 A4 cab blows out cold air at idle, but warm air with about 2500 revs. I've tried it with the air con on and also on econ mode. I've seen the other posts about sticking motors, is this my problem as well?

Thanks in advance for any help you can offer.

[kenney]

Get a fault code read on the climate control,to eliminate the possibility of a faulty flap motor.However your symptoms are those of a blocked matrix or a faulty coolant pump

[b1llyf1sh]

Sorry I forgot to mention, it's just come back from the main dealer after having cambelt, v belt and water pump replaced.

[kite]

What temp is the engine getting to ?

[b1llyf1sh]

Temperature is normal according to the gauge, it sits bang in the middle

[kite]

AS kenney says, stuck flap, dropthe glove box and have a look...

[kenney]

If the heater was okay before the belt replacement,there is a possibility there is air in the system

[Props Forward]

Bleed it and burp it. Loosely take the top hose off slowly going into the firewall, should reveal a tiny hole that the air escapes from.... only with a hot engine tho....

[b1llyf1sh]

Orry I've been a bit slack in updating this. It was an airlock, drew the hose slowly out of the firewall and bled it and now I have heat.

Thank you to everyone who offered help, it's appreciated.