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  #1  
Old 09-09-2015, 03:09 PM
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Location: Vancouver, BC
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W202 Heat is either hot or cold... no warm

Hey all, Trying to sort out the heat on my GF's 1999 C230 Kompressor. It is the "Classic" trim level so it has the twin temp knobs and the dials for the blower and vents, not the digital climate control system fitted to many of them

The passenger side previously worked fine and the heat modulated as you would expect. The drivers side has always either blown cold or hot, there is no warm section on the dial. Its like it just flips over from full cold to full hot, and now both sides are doing it.

I have disassembled and cleaned the duo valve and it made no difference to the issue. I'm assuming at this point it is working as I can get either hot or cold on each side so the valves must be opening and closing.

If you leave it in the middle section of the dials it will flip flop back and forth, scorching hot for a bit, then cold for a bit with no particular pattern.

I'm assuming at this point that its probably either the control panel itself or a sensor, but I have been unable to find any sort of information on how this system actually functions or what its components are.

Any and all help is appreciated.
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2004 F150 4.6L -My Daily
2007 Volvo XC70 -Wife's Daily
1998 Ford F150 -Rear ended
1989 J-spec 420SEL -passed onto its new keeper
1982 BMW 733i -fixed and traded for the 420SEL
2003 Volvo V70 5 Speed -scrapped
1997 E290 Turbo Diesel Wagon -traded for above
1992 BMW 525i -traded in
1990 Silver 300TE -hated the M103
1985 Grey 380SE Diesel Conversion, 2.47 rear end, ABS -Sold, really should have kept this one
1979 Silver 300D "The Silver Slug" -Sold
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  #2  
Old 09-10-2015, 01:41 PM
dude99's Avatar
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Join Date: Nov 2009
Location: Vancouver, BC
Posts: 1,493
bump for heat, winter is coming!
__________________
2004 F150 4.6L -My Daily
2007 Volvo XC70 -Wife's Daily
1998 Ford F150 -Rear ended
1989 J-spec 420SEL -passed onto its new keeper
1982 BMW 733i -fixed and traded for the 420SEL
2003 Volvo V70 5 Speed -scrapped
1997 E290 Turbo Diesel Wagon -traded for above
1992 BMW 525i -traded in
1990 Silver 300TE -hated the M103
1985 Grey 380SE Diesel Conversion, 2.47 rear end, ABS -Sold, really should have kept this one
1979 Silver 300D "The Silver Slug" -Sold
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  #3  
Old 09-10-2015, 05:58 PM
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Join Date: Sep 2004
Location: Seattle
Posts: 1,971
I never had that problem on mine and I have never heard of it. However, here is a thread that is maybe similar. Maybe it is the blend door motor. Don't know. Unfortunately MB Doc is not around to ask anymore.

http://www.peachparts.com/shopforum/ml-gl-g-wagen-r-class-unimog-sprinter/174945-blend-air-flap-actuator-motor-problem.html
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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra
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  #4  
Old 09-11-2015, 10:53 AM
dude99's Avatar
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Join Date: Nov 2009
Location: Vancouver, BC
Posts: 1,493
Interesting, thanks for the tip. I'll have to look into it.
__________________
2004 F150 4.6L -My Daily
2007 Volvo XC70 -Wife's Daily
1998 Ford F150 -Rear ended
1989 J-spec 420SEL -passed onto its new keeper
1982 BMW 733i -fixed and traded for the 420SEL
2003 Volvo V70 5 Speed -scrapped
1997 E290 Turbo Diesel Wagon -traded for above
1992 BMW 525i -traded in
1990 Silver 300TE -hated the M103
1985 Grey 380SE Diesel Conversion, 2.47 rear end, ABS -Sold, really should have kept this one
1979 Silver 300D "The Silver Slug" -Sold
Reply With Quote
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