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Thread: Temperature fluctuates

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    Default Temperature fluctuates

    Hello, I have got vx signum 2006 1.9 cdti (150), the problem is that the temperature gauge and the readings in testing mode menu are sligtly different, but anyway the main problem is it takes long time to heat up ant after that the temperature just fluctuates between 79 anr 96 degrees C depens on how I'm driving, for example on a motorway it falls down and in the city it raises, I've seen many discussions about that, but didn't realize is it termostat foult or erg? what to do and what to check first?

    Thank you!!!

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    Regular Member mattv6diesel's Avatar
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    Vehicle : Bmw 330d

    Trim : Msport

    Engine : 3.0d

    Year : 2008

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    Run it up to 70*c on the guage if the top pipe is hot thermostat failed.

    Failed ones will be hotter in town cause less air flow through the radiator

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    so I just wait till it reaches 70 and then grab the top one pipe? what about others has to bee cold/hot?

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    Regular Member djr69uk's Avatar
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    It's the thermostat mate. I wrote a 'how 2' for this as I did it on mine. Check in the section and it should give you all you need including part number. The thermo fails open, so the rad is getting the coolant 100% of the time, hence it cools down quickly when it isn't supposed to.

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    I addition can say that it rises to 98 degree and then fan cooler switches on if stationary.

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    Quote Originally Posted by evaldas View Post
    I addition can say that it rises to 98 degree and then fan cooler switches on if stationary.


    Nothing to worry about

    I panicked when mine showed 98 on Test Mode, as the guage showed 92, but the fans did their work and cooled it down in minutes

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