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Old 10-04-2012, 01:54 PM   #44
dmax
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Join Date: Aug 2006
Location: NJ
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My Ride: '99 328i 1.04646 mu
Quote:
Originally Posted by bryce-o View Post
167 degree coolant temp today with 78 degree ambient
I'm sorry, did you change your thermostat? If not, I think yours is broken open. That's 75 degrees C, and op temp should be 88-96 C or thereabouts.

If that temp was on the highway, I think therm is broken open even more so...and I don't see how a different ET cap would affect temperature...and if it did, I'm pretty sure that's not as good a thing as you think it is.

When therm breaks open, first sign, besides seeing the needle drop below dead center, is that the mpgs go down, by maybe 2-3 mpgs, since you're not at op temp and the engine isn't working efficiently.
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