I have 3.0 and yes you were spot on the darn expansion tank blew on the highway 5 yrs ago and i replaced that along with the hoses.
There is no loss of coolant from that point. If i do the thermostat i will replace the temperature sensor as well.
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Originally Posted by 270_BMW
After replacing the thermostat it couldn’t hurt to replace the temperature sensor as well... what engine do you have?
Also a cracked coolant resivoir is common on this series of vehicle.
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