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  #1  
Old 09-20-2002, 11:08 PM
MICHAEL J
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Help!! My Heater Will Not Turn Off In My 81 300 Sd...

AND I CANT DRIVE IT ,IT HAS EVEN STARTED TO WARP THE DASH ITS SO HOT ,ANY HELP WOULD BE GREAT I DONT WANT TO HAVE TO DISCONNECT THE HEATER.
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  #2  
Old 09-21-2002, 12:03 AM
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Join Date: Jan 2000
Location: PA
Posts: 5,440
Your heater/AC servo is probably stuck and not turning off the hot water to the heater core.

That happened to me in 2 of my 300SDs. One I replaced the servo (~$400) and the other (old beater) I put in a manually operated valve ($0).

Take your choice.

P E H
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  #3  
Old 09-21-2002, 01:37 AM
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Join Date: Nov 2001
Location: Cape Cod Massachusetts
Posts: 1,427
Question Monovalvitious?

Does the 81 126 have a monovalve?

http://mbdieseldiy.tripod.com/monovalve.htm
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  #4  
Old 09-22-2002, 01:08 PM
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Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150
You have a monovalve. If it is stuck open, you get heat all the time. However, it can also be the pushbutton control unit holding it open.

You pull it very easily -- two or four self-tapping screws and it just pulls out. If the rubber bellows is bulged or cracked, put a new one in. They tend to stick if the bellows swells, and when it breaks, the plunger in the solenoid locks in place, usually open.

Peter
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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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