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Old 05-29-2010, 11:56 AM
latief's Avatar
1993 300E 2.8- M104
Join Date: Aug 2009
Location: Gainesville, FL
Posts: 518
MonoValve too hot to touch

That thing is way too hot at normal engine operation, even with heat off..i can't even touch it without getting a burn....

is this normal? or is this an indication of an electric problem?


1993 300E, 2.8 M104 .....
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Old 05-29-2010, 12:09 PM
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Join Date: Oct 2005
Posts: 4,263
The coil is energized when the heat is off, so some heat will be generated. I have never measured the temperature of mine (although it's a duo-valve), but it does get pretty warm.
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Old 05-29-2010, 08:42 PM
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Join Date: Sep 2002
Posts: 23
Seems normal

I just installed a new duo-valve in my W140 - it works perfectly but is extremely hot to the touch

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