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  #1  
Old 10-24-2005, 05:27 PM
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300SD Heating, Winters coming!

I know heating is a common problem in these cars so hopefully someone will be able to help me out before winter comes! My heat doesnt work. The fan blows when on defrost, but not heated air. On all other setting no fan, but I can hear the valves switching to panel or floor. Please help me.

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Old 10-24-2005, 09:08 PM
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Do a search for monovalve.
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1984 300Sd 210k

Former cars:
1984 300D 445k (!!) (Strider) Original (and not rebuilt) engine and transmission. Currently running on V80 ( 80% vegetable oil, 20% petroleum products). Actually not, taking a WVO break.
1993 300d 2.5 275k. Current 120/day commuter
1981 300SD 188k (Hans) Killed by a deer
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Old 10-25-2005, 10:19 PM
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The monovalve is an easy fix.
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2001 E430 Sport, 204,000 miles
1997 C280 Sport, 144,000 miles
1991 300SL, 189,000 miles
1987 420SEL, 149,000 miles
1986 190e 2.3 16v, 151,000
1968 W30 442, 78,000 miles
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Old 10-26-2005, 08:10 AM
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Quote:
Originally Posted by randle2318
...The fan blows when on defrost, but not heated air. On all other setting no fan, but I can hear the valves switching to panel or floor. Please help me.
This could be a fan problem, with worn brushes that only allow it to run a full speed. It could be a bad Control Unit, not signaling the fan to run except in Defrost.

The switching you hear is probably the solenoids that apply vacuum to the various air flaps.

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