After talking to you at the office today, I think the following links will get you started in the right direction. Cover info on the monovalve and the blower relay.
300TE blower motor
Chilly heater in 1983 300TD
Not much, but it's a start.
BTW: Welcome to the best online Tech forum and Parts house going.
[Edited by MikeTangas on 02-17-2001 at 12:55 AM]
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.