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  #1  
Old 11-27-2010, 10:31 AM
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1987 300SDL heat problem

Hi,

The head will blow cold once I get over 50mph. When I slow down and am stopped at a light it is blowing warm. I have a similar problem on my w123 and the monovalve is the problem. I am not sure if it could be the same thing on my 300SDL.

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Old 11-27-2010, 10:41 AM
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It could.
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Old 11-27-2010, 12:28 PM
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Out of curiosity, Brian, does the '87 S-class have a duo-valve?
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Old 11-27-2010, 07:21 PM
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Quote:
Originally Posted by Jeremy5848 View Post
Out of curiosity, Brian, does the '87 S-class have a duo-valve?
Not familiar with the term "duo-valve"........??

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