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Thread: Thermostat or temperature gauge?

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    Default Thermostat or temperature gauge?

    I have a1.8 Design spec and seem to have thermostat problem(I think). I noticed yesterday that after about 10 miles of driving that that temp. gauge hadn't moved. We stopped for a cup of coffe and I checked under the bonnet and all seemed normal. Left for home and turned the heater up high and the heat seemed normal, turned the temp. down and cooler air resulted, again all seemed normal. At this point the temp. gauge started to rise and reached normal temperature after the normal time ie 3-4 miles. Is this a thermostat problem, airlock perhaps or a sticky gauge. Any advice would be appreciated. Thanks.

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    This time of year it will take longer for temp to rise.
    What reading is normal on your gauge ?
    Has any work been done lately on car ?

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    Default Thermostat or temperature gauge

    Quote Originally Posted by jodiexii View Post
    This time of year it will take longer for temp to rise.
    What reading is normal on your gauge ?
    Has any work been done lately on car ?
    It has never taken that long to rise, as I said in my thread 3-4 miles is the usual time to reach normal temp which is around the 90 mark. Haven't had any work done recently.

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    If your getting hot air and cold temp reading, sounds like water temp sensors Donald ducked

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    Full Member Leemarksmith's Avatar
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    Quote Originally Posted by jodiexii View Post
    If your getting hot air and cold temp reading, sounds like water temp sensors Donald ducked
    Thats what I'm getting at min, heaters are fine but only seen the temp needle move about twice, even then nowhere near 90?

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    Quote Originally Posted by leemarksmith View Post
    Thats what I'm getting at min, heaters are fine but only seen the temp needle move about twice, even then nowhere near 90?
    Quick update . Had the car out this morning for about a 6 mile run and everything was normal, correct temp reached in 3 miles and thermostat appears to be working correctly. Baffled but happier that all seems ok, could it be a sticky gauge?

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    Further update, after a month of inconsistent temp gauge I've had it in to a local garage twice and they say they can't find anything wrong. All they do is run the car at idle and let it reach normal temp. and put the heater on full but they say nothing happens in terms of temp. dropping. I've noticed that at 30 mph the car reaches normal temp but if I do 50 - 60 the temp falls right down to zero then recovers when I slow down to 30. It's got to be the thermostat surely but the garage say it's a common fault with Vectras and they will fit a new thermostat for £96 but can't guarantee it will fix the problem. That sounds strange to me, can anyone advise please.

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    Regular Member Vectra-c-SRI's Avatar
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    I have the same prob on the 1.9cdti 8v am thinkin coolent sensor so am goin to replace both thermostat and sensor. Prob be end of the month

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    I would say it is the thermostat! I had the same issues with varying temperatures depending on the driving, eventually the car just stopped heating up all together.

    If it is the VVT (ZX18ER) then the thrmostats are about £60-£70 to buy as they come in the housing and have an electircally operated solenoid to open and close the gate. I am suspecting that the garage has not actually priced the actual thermostat for your car??

    It took about 30 minutes to change. If you want to save a few quid, buy the thermostat and I will give you a hand to fit it FOC!! If you fancy a trip over 2 rivers to Seaham?

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    Its a common fault, replace thermostat housing and that should sort it. The temp gauge should stay at 85-90 and not drop when driving at any speed. If it drops back to 70 (which is were the gauge starts) then get it replaced. You will find that you will get much better heating in the cabin as well.

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