Does anyone have suggestions as to what might be the problem? I am having the exact same problem with my 84 300D. For the past few weeks if I pushed the buttons on the push button unit enough, I could eventually get hot air to blow out the vents, but that was sporadic. Now the only way to get any amount of air to blow out the vents is to turn the temp dial to MIN. Once I try to add heat, by either turning the dial to increase the temp or pushing the defrost button, minimal air comes out the vents. I can still hear the fan turning. Any suggestions? Thanks.
Tim