No heat from (1980 300sd w116) Help!!

Hercules86 · 10-15-2009, 08:01 PM

i just purchased a mint 1980 300sd turbo diesel from an orginal owner.

the only problem is that the heat doesnt work. it only blows ice cold air.

can anyone help me out here?

thanks

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C280 Sport · 10-16-2009, 06:12 PM

Hmmm well thats weird. Usually its the A/C that never works on a older car. It could be your heater core??

Hercules86 · 10-20-2009, 08:55 AM

the aux water pump was not worknig so we replaced that.

but now the power source that connects the water pump doesnt work and it was the other day which is weird.

we flushed the heater core and it fine.. no clogs or leaks.

all the proper wires are hot and cold where there suppose to be but nothing is getting inside the car.... all the lines stop at the servo box/heater valve which is prob the problem.

ive read that a bad climate control amplifier in the glovebox is responsible for the servo unit going bad because when the amp dies out it burns the servo unit up. im gonna test the amp and purchased a new one to see if that the problem.

if not i purchased a w116 servo bypass kit for 60 online that give me manual control of the heat put i can still use the fan controls to adjust where i want the heat. better then to spend $600 to replace the servo and have it break again down the line.

will post pics of the bypass job

10-16-2009, 06:12 PM	#2
C280 Sport MBWorld Fanatic! Garage is empty, add now Join Date: Jan 2009 Location: Saratoga,Springs New York and Sarasota, Florida. Posts: 1,240 Drives: 2011 E350 4M, 2006 CL600,05 C240 4M,02 E320, 87 420SEL. Other non MB's :)	Hmmm well thats weird. Usually its the A/C that never works on a older car. It could be your heater core?? __________________ 2011 E350 4Matic. 2006 CL600 2005 C240 4Matic 2002 E320 1987 420SEL

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10-20-2009, 08:55 AM	#3
Hercules86 Senior Member Garage is empty, add now Join Date: May 2009 Posts: 260 Drives: Sclass	the aux water pump was not worknig so we replaced that. but now the power source that connects the water pump doesnt work and it was the other day which is weird. we flushed the heater core and it fine.. no clogs or leaks. all the proper wires are hot and cold where there suppose to be but nothing is getting inside the car.... all the lines stop at the servo box/heater valve which is prob the problem. ive read that a bad climate control amplifier in the glovebox is responsible for the servo unit going bad because when the amp dies out it burns the servo unit up. im gonna test the amp and purchased a new one to see if that the problem. if not i purchased a w116 servo bypass kit for 60 online that give me manual control of the heat put i can still use the fan controls to adjust where i want the heat. better then to spend $600 to replace the servo and have it break again down the line. will post pics of the bypass job

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