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Old 11-29-2012, 11:14 AM   #9
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Join Date: Sep 2012
Location: Old Greg's Cavern
Posts: 12,254
My Ride: 2004 330Ci OBM
I don't know how an open thermostat would cause this problem. I can see it if the problem was the reverse: heat while idling, no heat while driving. For this situation an open thermostat doesn't fit.

Neotate, does your coolant temperature stay dead center when you are driving on the interstate? I mean DEAD center, not 2 degrees off.

Last edited by WDE46; 11-29-2012 at 11:15 AM.
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