Question about 1999 BMW 323 Series
This is most likely due to a faulty temp sensor which screws into the radiator. Once this cools down it should open the circuit and allow the relay to open as well. If the sensor is constantly closed it will close the relay and keep the fan on thus draining the battery. I would replace the relay and sensor assembly due to high heat while these systems are running. The sensor should be nearest the fill neck on the radiator. Let me know if you need anything else.
Posted on Apr 22, 2010
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Posted on Jan 02, 2017
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