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?

thanks,

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1993 300E, 2.8 M104 .....

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.

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