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W140 s320 1997 climate control problem

890 views 3 replies 3 participants last post by  Zayed 
#1 ·
Hi all, this is my first post:)
Strange thing I noticed every time I drive my mb on highways, after exactly 2 hours of driving blowing air from the central vent will stop and start blowing from the top vents (near to the windshield) .
The little blue button is on and no matter changes I do on the climate control (up, down, front) it will stay blowing from the top and the side vents only. This issue goes away after stopping the engine for a while.

What could be the issue here?!!
 
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