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#1
09-20-2002, 11:08 PM
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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
09-21-2002, 12:03 AM
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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
09-21-2002, 01:37 AM
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Monovalvitious?
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#4
09-22-2002, 01:08 PM
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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
__________________
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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