Ok, i have just bought this 300SD from SC, (great condition, 0 rust) drove it to ohio, RAN AWESOME. Didn`t skip a beat, But no heat. i started investigating the mono valve, and it has a Giant crack in the rubber gromet/ diaphram. i unpluged the top plug terminals on the valve hoping it will open up the valve so i can get some heat untill my parts show up(replacement mono valve). But it still wont get warm inside the car. the only time i feel some heat is when i drive it for a bit, shut it off, go into a store for a min, restart with the defrost on auto and i get 20 seconds of heat, then the cold starts blowing again. Now since i have learned a little i tried 10 min warm up, driving down the street about 20 deg outside and the monovalve is unpluged, should i not be getting warm? does the car not like me? ... do i have a problem with my circulating pump? or is my monovalve my whole problem? am i on the right track?

P.S. This is my first MBZ and i am its biggest fan.....

What degree does your temp guage show? If it is too low it may be a thermostat.

__________________
Rob Armstrong, Charlotte, NC
Mountain Island Lake
RobAinCLTNC@hotmail.com

2004 VW Passat GLS TDI-50k
2006 Honda Odyssey EX-L 7k
FOR SALE 1991 300TE 228k

2003 Subaru Outback 57k Silver/Black-SOLD
2005 C230K 18k Pewter/Grey-SOLD
1997 E420 108k Black/Grey-SOLD
1986 560sl 200k Black/Palimino-SOLD
1985 300sd 340k-SOLD
1979 240d 170k-SOLD
2000 Volvo V70XC-POS couldn't sell fast enough

80deg C all the way up from sc (10hrs)