Need Heater Help

[Tynee]

Originally Posted by LockDoc

-
It sounds to me like you have an internal air control door inside the heater that is not opening so you are getting outside fresh air coming in instead of air through the heater core... Just a guess.

LockDoc

Second that. It goes back to my original suspicion. Do all of the control levers move with equal ease? The one labeled "AC/Heat cable middle lever" on page 11 of this link:
http://www.vintageair.com/DownloadsS...ols)%20Ine.pdf
is the one that I suspect is either detached from the lever, detached from the little stud at the flapper, or has broken the flapper loose, and is really only rotating the "axle" of the flapper door. If you can put one hand on that little stud while you move the lever back and forth with the other hand, you should be able to tell where the problem is. good luck!!