I checked the monovalve with an ohm meter, the one in the car in question measured as open, the one in my parts car measured 3.5ohms. Not sure what is proper resistance is. I sawapped them and I'm still getting warm air out of the vents.

As far as the fan, I suspect the regulator, I put a new motor in but a used "porcupine" last year, I'll swap that out tomorrow.

Gotta love these things, park the car one evening and everything works, get in the next morning and something doesen't....sunroof, blower, I wonder whats next.

__________________
82 300TD - 130k
68 280SL - 135k
91 300TE - (sold)
87 300 TD (sold)
89- 300E - Parts beast (sold)
90- 300E 2.6 (daughter's)

plus a couple of Toyotas and a Volvo