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1998 Mercedes-Benz ML320 Question: Air conditioner

 

Question

Geyendw, Manvel, TX, June 25, 2009, 09:18
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When I turn on the air conditioner switch. A clicking sound come from the vents and extremly hot air blows from the vents. This occurs when the A/C is on. What could be the problem.

6 Answers
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  • Answer #1

    dandd June 26, 2009, 11:40
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     Master

    Your Automatic Climate Control is malfunctioning and needs to be scanned with a good MB capable scanner at a good MB independent shop. The Hot Air is usually a fail safe mode when the Auto Climate Control acts up. It is so people don't freeze in winter, but it is very uncomfortable in Summer.

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  • Answer #2

    Visitor, March 25, 2010, 07:43

    I am having the same problem. Did you ever figure out what was causing the clicking noise. Mine still works great/blows cold just makes that noise if the switch is on high or in the blue/really cold a/c setting.

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  • Answer #3

    luvmybaby June 15, 2010, 13:06
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    I am having the same problem in Chicago. The sound is un-nerving! Please let me in on the solution.

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    Visitor, June 25, 2010, 15:29

    blend motor is bad,,,,its a $95 part,,,just whole dash needs to come out to install

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    joymebyer, January 28, 2014, 16:05
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    So is this going to a be a recall also it drive me nuts!

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  • Answer #4

    Visitor, November 09, 2010, 06:23

    I had the same problem. The climate control switch had to be replaced and a few other things. It ran me around $1,700 for parts and labor at a local dealership, not what I intended to pay.

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  • Answer #5

    The Brig September 13, 2011, 13:00
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    You have a faulty air blend door actuator. Google "detane" and "ML320" and you'll find a good video on how to replace it. It helps to have small hands to repair it this way. Otherwise you have to remove the entire dashboard.

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  • Answer #6

    whodaie June 30, 2013, 09:58
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    Since mine is a '98 during summer I use a copper tube and bypass the heater core. Also I cover core inlets.This allows the a/c to cool and not share heat from the core. I also ture the temp setting to silence the ticking.

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