Hello, I have tried to find some info on this problem and could not.

We are working on getting airflow to come out the vents, for example: Turn the temp. wheel to max heat and push the defrost button....blower motor is working very well but no airflow(heat) comes out the vents on the top of the dash. In any selection on the ccu we get no airflow from any vents, but the blower motor is absolutely working.

I am wondering if there is a main flap somewhere that is not opening, like close to the blower motor box. This is on the 1985 300TD, Thanks.