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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.

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Old 01-02-2010, 06:49 PM   #1 (permalink)
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Temperature Guage

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?
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Old 01-02-2010, 07:42 PM   #2 (permalink)
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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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Old 01-04-2010, 09:08 AM   #3 (permalink)
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Just went thru the exact same thing. It turned out to be the connections at the temp sensor. wiggle jiggled and cleaned. works great again. Good luck.
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Old 01-04-2010, 04:07 PM   #4 (permalink)
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OK, I will have to give that a try...where is the sensor located?
I have noticed that if I shut down and then start up again...it fixes the problem...so, yes, it does seem to be a sensor problem.
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Old 01-04-2010, 04:19 PM   #5 (permalink)
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Originally Posted by BMWer14 View Post
OK, I will have to give that a try...where is the sensor located?
I have noticed that if I shut down and then start up again...it fixes the problem...so, yes, it does seem to be a sensor problem.
Not sure on your car check here: RealOEM.com Just enter your car, make, and model. It should give you a diagram that will show you where it is located.

This is a great site sent to me by another member in the forum (marti5).
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Old 01-10-2010, 07:41 PM   #6 (permalink)
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Its probably the thermostat. Mine did the same exact thing. My thermostat was stuck open. Also my expansion tank was cracked. Replaced it too.
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