No or little defrost, only blows mostly front vents - Mercedes Benz SLK Forum

SLK R170 General Discussion SLK 200, SLK 230K, SLK 320, SLK32 AMG

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#1 Old 06-12-2015
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No or little defrost, only blows mostly front vents

My 2000 SLK230 (4 years) has seemed to blow only from the front vents and now since winter time won't blow from the defrost vents. I searched on SLKWorld but didn't see any posts for this problem. Any help would be appreciated. I am redoing consoles so good time to do it!

Lanny
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#2 Old 06-13-2015
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search duovalve?

https://www.google.com/webhp?sourcei...m%20r170%20duo


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#3 Old 06-14-2015
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Originally Posted by jbanks15 View Post
I don't think it's in the duo valve since he didn't say anything about the temperature. It seems to be in the vacuum operated doors in the dash unit.

Do you hear any vacuum leaks in that area? Listen carefully since it may be a broken or disconnected hose.
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#4 Old 06-16-2015
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JiminFL,

I don't hear any vacuum leaks. I just had the consoles out and check behind but unless I really know what I am looking for it will be hard to troubleshoot. I did see the mechanism move when you turn the switch. Thanks for the input, I will research more and may this winter look more into it. June Florida hot hot!

Lanny
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