2001 BMW 325 Engine is not holding the temperature in cold

2001 BMW 325
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SAMADAZ
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Engine Mechanical problem
2001 BMW 325 6 cyl Two Wheel Drive Manual 170K miles

For last couple of weeks, the engine is not holding temperature in cold weather. In idle state engine gets warmed up after 10-15 minutes; however, as soon as I start driving, the temperature of the engine starts falling down, and the temperature needle moves to blue region soon from the center. At the same time, the internal heater starts blowing luke warm to cold air. Couple of months ago, I had raditor fulid flushed, air filter and oil changed. Since for last two weeks weather got bit colder, I have started noticing this problem. Any help will be greatly appreciated.

Thanks,
Azfar
Jan 2, 2010 at 3:31 AM
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DOCHAGERTY
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I recommend replacement of the thermostat. It is likely stuck open.
Jan 2, 2010 at 9:05 AM