Quote:
Originally Posted by bcbuilder
Just had some work done on the BMW about 4 weeks ago. New radiator, hoses & thermostat.
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Likely caused by air in the cooling system. BMW's are a bitch to bleed the air out of the cooling system on. They can work fine a while but suddenly the temp gauge goes up or down because of not good enough circulation.
Did you change the water pump? They are a common failure point. (plastic impeller cracks, comes loose and at last explodes into a million plastic pieces)