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Thread: coolant temperature dropping

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    Default coolant temperature dropping

    Hi all. Im new and purchased a 1.8 petrol 2003 vectra c about 4 months ago. Im having trouble with my coolant temperature. At idle the car slowly increases and sits at 87-90c fan comes in at 91+. All sounds ok until you drive away after mins of drivin at any speed the temperature disappears so much its not recorded on the gauge. Also you get no heat through the vents when this happens. I changed the thermostate and now it only drops to 75c. But still not a lot of heat. When at idle at 90c which fans on number 4 speed the heat drops off after about a minute!! What could it be? Could it be the heater matrix?

    Thank you for any help
    Regards Andy

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    was it an original gm thermostat ?

    you might have air trapped

    have a read of this

    http://www.vectra-c.com/forum/showth...ter-temp-gauge
    Last edited by vectra ste; 18th November 2012 at 21:22.

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    Hi i bleed the system well run at idle with the cap off. But to have a lock before and after fitting the new thermostate is strange. Done complete flush and change twice still the same.

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    was it an original gm thermostat ?

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    No i don't think it was. Do you have trouble with aftermarket thermostats?

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    Hi all. Been told today to try the heater valve sits on the engine at the back and the heater matrix pipes go onto it. Apparently vauxhall modified it due to problems. What's this called and what does it do? And anyone know how much they am?

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    Quote Originally Posted by vectra ste View Post
    was it an original gm thermostat ?
    i remember a member on here called kaput had problems in post 22 with a non vauxhall one

    http://www.vectra-c.com/forum/showth...Question/page3

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