I had no heat after replacing the water pump on my 96 Audi A6 quattro. After reading the last post, I found a bleeder on one of the hoses going to the heater core. I just turned it and it allowed the air to escape. Then I had heat.
There is a flap that is controlled by a servo motor (temperature blend flap motor). When this stops working the blend door stays in the closed position and does not allow air to move over the heater core.
It is located under the cowel cover, the motor is under a cover on the drivers side of the box and the linkage is directly across on the passenger side (white plastic). If you change temp. settings and this doesn't move then it is not working.
There is also a coolant shutoff valve that is inline with the heater lines under the cowel cover. make sure it is allowing coolant to pass through. It is likely this is not the problem but never hurts to check. (Default is open so failure means heat usually)
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