I agree. I was actually reading up on this today becasue at idle my car gets near 120 .. which i think is due to the aux fan not kicking in.. but 90, from what everyone says, is perfectly ok.

I do have a question though.. not to hijack this.. but does the engine fan always run or is it only supposed to engage at a higher temp?

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'87 300D new to me
'85 300D Sold
'83 300cd Sold