Question about 1993 Mercedes-Benz 190

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1993 Mercedes 190 E Defroster problem

My 1993 190 E Benz will sometimes on its own blow very hot air from the defroster vents and the driverside air vent, the majority of hot air comes from the drivers side and only an small amout of hot air from the passenger side. Doesen't always happen but when you least expect it is cooking you in the face. This happens even when the A/C is in operation or when all ventilation system is inactive. Please help my i'm frying my brain.


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  • warmst Aug 29, 2008

    If it is the blend air servo motor where would it be located and how difficult is it to validate the non functioning of the door movement open and close?

  • warmst Aug 29, 2008

    Is the motor on its own fuse system which could need to be cleaned and replaced?



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Chances are a blend air servo motor is not operating and a door is stuck open which lets the hot air from the heater core out through the vents

Posted on Aug 28, 2008

  • Ronald Mueller
    Ronald Mueller Aug 29, 2008

    they are located under the dash and it's alot easier for a qualifed tech to replace them if need be .trying to take the dash apart is a nightmare if you don't have the right tools and damage could result,which on a benz is real expensive.

  • Ronald Mueller
    Ronald Mueller Aug 29, 2008

    these motors do not have fuses the are linked and powered by the climate control system through the power control module and the ecm(main computer)


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