Quote:
Originally Posted by bcredliner
I do believe I’ve figured out what goes on with the thermostat failures. Each one occurred within days of an extended idling period (3-4 hours) while commuting home at a crawl during very cold, icy weather. Under these conditions, every bit of engine heat was consumed trying to keep the windshield clear and the interior warm, so the engine thermostat would have been powered to stay closed or nearly closed most of the time. I suspect a higher current flow to the thermostat for that amount of time simply “burned it up”.
The thermostat opens and closes based on coolant temp. It opens and closes even in extreme weather temps. Were you in DFW area when this happened?
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Yes BC, each time. They were the "ice" days over the past couple years where in typical Dallas tradition, everyone with a car leaves their office at the same time when anyone sees a snowflake. So my 31 mile commute takes three hours of idle speed driving to get home - worst kind of drive for an engine and our CCV system.
2002 X5 3.0 358,400 miles
2014 428i 63,000 miles
2004 325i sold at 123,600 miles
2001 325i sold at 66,000 miles
1070 Firebird Under restoration