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Originally Posted by t walgamuth
yes it matters. there is an up and a down. if you put it in upside down it will not function properly at all. it will overheat, if my mimory serves me correctly.
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God$%#(UI(@ I'm so sick of taking thermostats in and out!!!!

I've used SOO much time and coolant doing all these cooling system projects I'm ready to just leave it alone for 2 years like the manual says you do (wishful thinking, I suppose) until the next flush.
It's funny the Haynes manual doesn't say anything about this, and too bad I got the Mercedes manual CD after the fact.
Oh well, if this makes my temps drop, I'll report back.