I have a 2007 530XI and below 20F the car has trouble heating up. I have changed out the thermostat and still have the same problem. Any suggestions?
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John, that sounds absolutely right. there is nothing wrong with that. It proves the efficiency of your Bimmers cooling system. I do understand that it does get chilly on the inside if it does not heat up properly, especially if you add the windchill while driving :-). Check with your local BMW dealer, there used to be kidney grill flaps that one could get installed to decrease the amount of cooling air through the radiator. A lot fancier than the cardboard box in front of the radiator:-)
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You could also have a plugged heater core. Sludge builds up and over time clogs the core so its not as efficient or worse fully blocks it. A good reason to flush & refresh your coolant.
Thank you Dan. I don't think it is the heater core either. The water temperature drops in the engine when it gets this cold as well. I guess I will use the card board.
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