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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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Old 12-01-2004, 01:15 AM   #1 (permalink)
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i dont know if this is even a problem, or is just caused by my commute.

my morning commute consists of 22 miles of freeway. the car has maybe 5 minuets before getting on that freeway. when i first start it, the car will slowly warm up. but lately i've noticed that after 22 miles of going 70-90mph, the temperature is only 1/4 the way up. as soon as i get off the freeway and go up a big hill, it slowly climbs up to the normal posistion and is at the halfway mark by the time i park. does anybody find it weird that the temperature gauge wont move up until i am off the freeway? do i possibly have a stuck gauge? or a bad temperature sensor? or is it just the commute? or possibly the thermostat?


by the way, im new to this board. i frequent bimmer.info and bimmerforums
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Old 12-01-2004, 07:04 AM   #2 (permalink)
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this is weird... u can try wheter ur gauger has a problem is: when u start ur engine (before travelling), turn on ur air cond... let's say to the highest power and observe in 2-3mins if ur gauger shows a good way up... u can go compare with other car and see how it goes... if the same thing happens, it might be some problem with ur heat exchanger path way around the mixing chamber housing(piston surrounding area) lets say the coolant is frozen in that pathway...
or ur gauger has a bit problem...

This is interesting, tell me how u go
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Old 12-01-2004, 09:25 AM   #3 (permalink)
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thanks for the reply. its been suggested that my thermostat is stuck open. i will try to check that out. if it is not that, then i will pursue your idea. thank you. anybody else?
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Old 12-01-2004, 02:22 PM   #4 (permalink)
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I would run with the Thermostat Idea. Seems to be the most common in these types of situations. Although it is very possible that your sending unit is kaput, I would start with the Thermostat. Pull it out, boil it in a pan of water and see what temperature it opens (if it's not stuck open). Once you see it open, run the thermostat under cold water, and see if it closes. Sometimes even when closed, it will open at a much cooler temperature than it's supposed to. Good luck, keep us posted please.

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