3-Series (E46, E90)Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.
I have a 2000 323i E46..this problem just started occuring. I had not run the car for over a month because of snow and cold here. But, I got it out a cople of days ago. I noticed that the temperature needle was not coming out of the blue after about 5 miles of driving....then all of a sudden it went right into the red...I pulled over, shut down the car and checked for overheating, but everything seemed normal. When I restarted the needle went back to the top edge of blue and stayed there the rest of the trip (another 15 miles), I topped up the coolant about a pint when I got home. It did the same thing today...but after I shut it down and restarted it was back to normal. Would this be a faulty temp sending unit or faulty thermostat? Or what else?
I had something similar happen to me a few years back with my 2000 528i. It sat in the garage for nearly a month and when I finally started it I had a similar issue as to what you're describing. However, after some driving everything was fine. I thought at first I had a sticky thermostat or a bad temp sensor like you said but everything was fine. I just chalked it to the cold and the fact the car sat there for so long.
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