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1998 Mercedes-Benz S420

Question: WHAT IS THE NAME OF THE PART THAT CIRCULATES HEAT INTO THE PASSENGER CABIN?

Question

ROCKSAMSON, South Orange, NJ, November 04, 2009, 09:31
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 Enthusiast

I REPLACED THE BLOWER MOTOR AND AM NOW GETTING FORCED AIR INTO THE PASSENGER COMPARTMENT. UNFORTUNATELY THE AIR IS "WARM" NOT HOT. I'M TOLD THAT A PART THAT SITS ON TOP OF THE ENGINE BLOCK (ON THE RIGHT HAND SIDE IF YOU ARE FACING THE CAR). THE PART HAS THREE ALUMINUM CYLINDERS ABOUT 2" TALL AND 1/4" IN DIAMETER. I'M TOLD THAT THE HEAT FROM THE RADIATOR MOVES THROUGH THIS PART AND IT MAY BE CALLED A "D MODEL VALVE". I CAN NOT SEEM TO FIND A PART BY THAT NAME ANYWHERE. ANY IDEA(S)?

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  • Answer #1

    dandd November 05, 2009, 19:09
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     Master

    I would check your engine thermostat. The heater control valve ( the part you are referring to ) generally either works or it does not. How hot does your temp gauge go, doe it go over say above at least 80-90 degrees C? If not, check your thermostat, it may be stuck open . Any Check Engine Lights? Could be a code for your thermostat. Very common.

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  • Answer #2

    Visitor, April 05, 2010, 14:09

    I have a 1999 S420 and had my resistor replaced. A/C AND HEAT WORKED GREAT FOR 8 MONTHS AND AGAIN - NO FORCED AIR. UG

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