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  1. #1
    VXRed
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    Question Engine temperature ... ?

    Hi... noticed the last few days when morning temps are down below 5c that even after a 15mile drive the engine temp doesn't get above about 75c and the oil in turn is 50odd.
    Ok...im driving gentle but do these cars have any known thermostat issues as to me it's behaving as if the stat is stuck open.
    I know the car sat in the dealers about 6 months before I got it so could that have caused a problem ?
    It's under warranty but I've no time to get the car to them.

  2. #2
    Are you VXR enough? Dalle1985's Avatar
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    As I remember, mine was hot within 5-10 minutes no matter what the outside temperature was, so could sound like a thermostat issue. Does it ever come up to full temperature, i.e. On a very long drive?
    2010 Insignia OPC Sports Tourer

  3. #3
    VXRed
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    Not lately with the cold weather creeping in.... was fine during the summer but I'd expect that with reduced air cooling over the rad core.
    It's screwing up the fueling as well ... dropped 5mpg on my work run.

  4. #4
    Are you VXR enough? Dalle1985's Avatar
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    That is not at all unlikely with a failing thermostat - it is going to suck a lot of heat out of the engine and therefore increase fuel consumption. Have you tried to start the engine from cold with the expansion tank lid off? I would expect it only circulates the cooling water in the tank if the thermostat is locked open when the engine is cold.
    2010 Insignia OPC Sports Tourer

  5. #5
    VXRed
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    Are these traditional stats in a weird housing or a smart stat controlled by the ecu?
    So far I'm finding the engine heats a little better if keeping the cabin heater at 25 or lower which allows the engine to get to just under the mid point of the gauge.
    She's due a service in a few weeks so at least it's a warranty job in my case.... doesn't look like a 5min job to change out.

  6. #6
    VXRed
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    New stat fitted by VX dealer under warranty...O ring seal inside the original housing had gone a weird shape and wouldn't seal ...looked like it reacted with the coolant.
    Oddly after getting this sorted most of my clutch slip issues stopped...can't see how the 2 would be linked but feels better at the pedal as well.
    Anyhow its great to have a warm cabin again.

  7. #7
    Are you VXR enough? Dalle1985's Avatar
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    Quote Originally Posted by genman View Post
    Oddly after getting this sorted most of my clutch slip issues stopped...can't see how the 2 would be linked but feels better at the pedal as well.
    When was your transmission and brake fluids last replaced? Maybe the lower temperature caused colder fluids... just a guess.
    2010 Insignia OPC Sports Tourer

  8. #8
    VXRed
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    Cars 2015 so all original fluids... Now just new coolant

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