2003 Audi A4 1.8T CVT

Hey gang,

I have been searching all over the forum(s) for information. Tried a bunch of things, but to no avail.

The heat on the driver's side has stopped working. Ice cold (outdoor) air is being blown through. The passenger side has heat (although, it has become cooler in the last several days).

I have replaced the flap on the driver's side. Coolant levels are all fine. For a while, if you set the temperature on the driver's side to LO and then gradually moved up the temperature, heat would come out until you hit 70F, then cold air again. Now, that trick isn't even working. I have tried AUTO and manually mode.

Not sure if a heater core flush will do the trick since it's only on one side.

Please let me know if any of you have had a similar issue and what exactly you did to resolve it.

Thanks guys!