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1999 Mercedes-Benz S420

Question: Heater works only on the passenger side but not the driver or the back

Question

amaamo, Fremont, CA, January 23, 2012, 11:09
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 Rookie

i get hot and nice air on the passenger side from all vents but cold air on the driver side also from all vents and cold air in the back vent in the mid HELP HELP HELP

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  • Answer #1

    ccsmog from Contra Costa Smog and Repair, January 23, 2012, 17:29
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     Journeyman

    sounds like the blend doors may be not opening. I recommend taking it in to your repair shop as this is not an easy fix.

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    amaamo, January 25, 2012, 09:06
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    Thank you

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  • Answer #2

    Hal... (see my shops), January 23, 2012, 20:41
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     Master

    Actuators or blend doors not working correctly. Can you hear clicking sounds?

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    amaamo, January 25, 2012, 09:05
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     Rookie

    NO

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    Hal..., January 25, 2012, 10:55
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     Master

    The clicking sounds are broken plastic gears so you might just need a new actuator for on of the blend doors.

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    amaamo, January 25, 2012, 11:52
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     Rookie

    Thank you for your help

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