I got BMW E90 325 I 2006, it show high temprature mark ( yellow then red)
sometimes it dont give that mark, icould drive it all the day and some I just trun on my car and after 10-15 minutes the mark comes.
i have been talk its the electrical water pump my mileage is 80,000 miles, I turned my car on and I sow the pump workin by pumpin back the water to the water box above.
then I thought it my be workin sometimes and others fail, so I waited when the temp marks yellow then I park on the road and senses the water box, it feels cold which declare that the water pump not work. Then I wait tell the fan stops and cool down for app. 10 minutes, then I drive my car with no hugh temp mark.
please help me I dont want to change my water pump and thermpstat for 800 $ and i`m not sure, knowing that there is no mark on the scanner for pump fail or and thing else.