How did you solve your problem? I have a similar circumstance. My car will blow warm air after I turn the engine off and then back to cold when it is running.
1988 560SEL, Green, Chrome wheels.
2000 Suburban, 20" wheels, DVD, wood grain dash (wife's car).
67 Beetle euro, Lots of Empi parts.
69 Beetle conv, 1980s cal look.