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Thread: Engine temperature up and down

  1. #1
    Regular Member benwalters82's Avatar
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    Vehicle : Vectra

    Trim : SXI

    Engine : 2.0DTI

    Year : 2002

    Default Engine temperature up and down

    It's another one of those threads I'm afraid - possibly or possibly not a problem arising. Any comments are welcome.

    So for as long as I can remember (had the car 3 1/2 years) my 2.0 DTI warms up after about 6-8 mins of driving then stays constant at 85 degrees, regardless of outside temp, i tend to stick to 70-75 for economy. I do 70 mile commute every other day on mainly dual carriageway.

    Recently my mpg has fallen from a steady 50 mpg to 45-47 (brim to brim measuring). The temperature gauge has also started moving between 78-86 for no apparent reason.

    Any thoughts?

  2. #2
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    Vehicle : vectra c

    Trim : ls

    Engine : 1800 non vvt

    Year : 2004

    Mileage : 136000

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    Quote Originally Posted by benwalters82 View Post
    It's another one of those threads I'm afraid - possibly or possibly not a problem arising. Any comments are welcome.

    So for as long as I can remember (had the car 3 1/2 years) my 2.0 DTI warms up after about 6-8 mins of driving then stays constant at 85 degrees, regardless of outside temp, i tend to stick to 70-75 for economy. I do 70 mile commute every other day on mainly dual carriageway.

    Recently my mpg has fallen from a steady 50 mpg to 45-47 (brim to brim measuring). The temperature gauge has also started moving between 78-86 for no apparent reason.

    Any thoughts?

    is your heater on when its moving between 78-86 ?

  3. #3
    Regular Member benwalters82's Avatar
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    Vehicle : Vectra

    Trim : SXI

    Engine : 2.0DTI

    Year : 2002

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    blower number 1, heat just about half way

  4. #4
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    Vehicle : vectra c

    Trim : ls

    Engine : 1800 non vvt

    Year : 2004

    Mileage : 136000

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    try it with the heater off and see if the gauge moves between 78-86

  5. #5
    Regular Member benwalters82's Avatar
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    Vehicle : Vectra

    Trim : SXI

    Engine : 2.0DTI

    Year : 2002

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    Heater off and the gauge still moves

  6. #6
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    Vehicle : vectra c

    Trim : ls

    Engine : 1800 non vvt

    Year : 2004

    Mileage : 136000

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    pm ed you

  7. #7
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    Vehicle : z

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    Replace the thermostat

    ---Sent from my iPhone 5 using Forum Runner

  8. #8
    Regular Member benwalters82's Avatar
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    Vehicle : Vectra

    Trim : SXI

    Engine : 2.0DTI

    Year : 2002

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    Is there a 2.0DTI How 2? can see other engines

  9. #9
    Regular Member benwalters82's Avatar
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    Vehicle : Vectra

    Trim : SXI

    Engine : 2.0DTI

    Year : 2002

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    bump

  10. #10
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    Had the same issue recently on my 2.0DTI, literally changed the thermostat today and was relatively easy, im sure there is a how2 in the How2 section. Havnt seen whether its fixed the problem yet but i will find out Monday.

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