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Thread: 'normal' coolant temp

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    Default 'normal' coolant temp

    Hi,
    I drive a 1.8 (52 plate) and am worried that that my thermostat may be stuck open. The car takes maybe 5-10 miles to get warm (75-80 oC) on the dial when driving normally. Stop and go driving puts it at 90ish. Am I running cold?, is there a way to test for the thermostat?, or is this normal behaviour for a 1.8. Any comments appreciated. Thanks

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    Regular Member Gsi3.2's Avatar
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    it should warm up faster than that.. are you taking the temp readings from the notoriously innaccurate dial on the dash or from a laser Temp probe??

    The thermostat should open at 82 -85 degrees C.. when you next cold start the car, find the top and bottom hoses and feel the heat differential in them..

    You should be able to feel quite a noticable sudden increase in heat within the pipe as the stat opens..

    if it's a more gradual increase then the stat is stuck open.. To finally check, you could remove the stat and immerse it in a pan of water and bring it to the boil, you can then watch it open..

    Normal operating temp should be around 82 degrees C with the cooling fan cutting in about 90 degrees C...

    alternativly it could be a fault with the temperature sender... likewise, still a cheap part and dead easy to replace..

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    Thanks for the reply. I tried to feel the hoses - the top pipe is warm even after a short (1/2 mile jouney) with the bottom pipe cold. After a few more miles both pipes are hot to touch but with the dial/gauge still reading <75.

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    Regular Member Gsi3.2's Avatar
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    sounds like a dud sender unit then to me mate..

    if both pipes are warm/hot then the engine should have reached 82 deg C..

    for the few pounds it is i'd throw another sender unit in it..it's a simple screwin design and it won't take 5 mins to change..

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    Default Slow warm up 2.0 DTi

    I have a slow warm up problem with a Vectra-C, 2.0DTi. It takes 3 miles for the needle to move, then another 2 miles for the needle to reach 85 C. Anyone with a similar engine comment please?

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    From what I've read yours seems 'normal'. I've not done anything about mine, and in summer mine sits quite easily between 80-90 after ~3 miles. Motorway driving on long downhills still brings the needle <70 though. My milage is OK, so I left it alone.

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    My 1.9CDti 150 takes about 3 or 4 miles to warm up. It used to sit at 85 and never move till I fitted the spider box, now its usually nearer 90. Nothing seems to make much difference

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