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#1
12-29-2003, 09:31 AM
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82 300SD Heating problem
The car will not heat properly. It would blow cold air at a high level when the outside temperature was cold. It blew hot air at a high level when the outside temperature was warm (50 degress or more). Once in a while it would operate properly. Now it just blows cold air regardless of the outside temperature.
WHAT SHOULD I BE LOOKING FOR??? And where it the thing I'm supposed to look for located? Richclay 
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#2
12-29-2003, 10:57 AM
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heating problem diagnosis
Hard to tell based on limited information, but....
1. check to see if engine temperature gets up to normal (85 - 90 C)...if not thermostat may be bad. The erattic behavior is also consistant with a thermostat going bad. 2. In your 82, I think you have the automatic climat control, but I dont know if the same as my 85 300D....but probably similar...could be inoperable "mono-valve"...this controls flow of hot coolant to heater coil, controlled by signals from push button climate control unit. Rebuild kit costs about $35 and takes about a half hour to complete. 3. Malfunctioning pushbutton control unit....cant be repaired by DYer if this is the case....rebuilds cost about $100+ good luck, Mark
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1984 300TD Wagon, 407,800 mi (current daily driver) 1985 300DT Sedan, 330,000 mi (gone to that great autobahn in the sky)
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#3
12-29-2003, 06:12 PM
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The mono valve is most likely your problem. They are easy to rebuild. On the 123, it is mounted on the firewall. It is square on top with a cylindrical center piece.
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My Truck.. 2007 DODGE, 5.9 Cummins, 6spd stick, 4X4. My car..1977 240D, OTHER WHEELS...1955 VW Oval window bug, European Delivery (Holland) with a 1700cc, 2 barrel, Porsche drum brakes. 1939 WILLYS Pick-up. 1967 Triumph 200cc Tiger Cub. 1976 Honda 550F 4cyl Motor Cycle.
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