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Thread: How to test Cooling Fan

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    Regular Member stevie16v's Avatar
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    Vehicle : Vectra

    Trim : SRI XP1



    Default How to test Cooling Fan

    Wasn't sure wether to put this in here or electrical so feel free to move it if needbe. Changed my thermostat today, first time I have ever seen the needle about 80! However, I kept the engine running, wasnt out driving just stationary. And It went up to 90 and still no sign of the cooling fan coming on, Anyone know what temp it comes on at? I'm going to take it for a run tomorrow because I ain't getting any heat out the blowers so there must be a wee air lock

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    Vehicle : Golf 7

    Trim : GTD

    Engine : 2.0 TDI 184PS

    Year : 2014

    Mileage : 40000

    Default

    I think it comes on at about 92C. When my thermostat was bust the temperature would rise to 92C in traffic conditions and wouldn't rise any further. Once I drove off the temperature would drop back down again.

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    Full Member Leemarksmith's Avatar
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    Vehicle : Vectra

    Trim : SRi (VXR Styling)

    Engine : Z19DTH (Re-mapped)

    Year : 04

    Mileage : 110k

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    My car temp stays at 90 all the time, should I be worried!

    I have blanked the EGR like.

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    Full Member Leemarksmith's Avatar
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    Vehicle : Vectra

    Trim : SRi (VXR Styling)

    Engine : Z19DTH (Re-mapped)

    Year : 04

    Mileage : 110k

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    My car temp stays at 90 all the time, should I be worried!

    I have blanked the EGR like.

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    Regular Member stevie16v's Avatar
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    Vehicle : Vectra

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    i think thats about normal mate. I just wasn't sure what temp the fan kicked in at

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    Regular Member alcutler's Avatar
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    Vehicle : vectra c 1.9cdti 120 estate

    Trim : design



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    If you use Op Com you can get it to test your fan - I would think if it was faulty it would come up with a fault code

  7. #7
    Regular Member alcutler's Avatar
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    Vehicle : vectra c 1.9cdti 120 estate

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    Quote Originally Posted by leemarksmith View Post
    My car temp stays at 90 all the time, should I be worried!

    I have blanked the EGR like.
    Wouldn't worry too much about that - there are always slight variations in the accuracy of the temperature gauges and the temperature sensors, and the thermostats are rated at 88 degrees anyway. If Thermostats do fail they usually fail open, which means the engine is always running cooler and does not overheat. Simplest way to test your system is let it tickover until the fans come on and check the temp gauge - should rise slightly and then drop down to normal when fan cuts in. (Good job fuel is still cheap )
    Last edited by alcutler; 16th March 2012 at 09:29.

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    Regular Member Critch's Avatar
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    Vehicle : Mk1 renault scenic... I know I know but it drives

    Trim : Basic

    Engine : 1.6 16v

    Year : 2003

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    Fan should cut in if you disconnect coolant temp sensor.

    If you don't own any diagnostic kit

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    Regular Member Critch's Avatar
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    Vehicle : Mk1 renault scenic... I know I know but it drives

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    Engine : 1.6 16v

    Year : 2003

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    Fan should cut in if you disconnect coolant temp sensor.

    If you don't own any diagnostic kit

  10. #10
    Regular Member rich r's Avatar
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    Default

    Normal operating temperature for all the engines used in the Vectra range (and indeed most engines) is 85°C to 95°C. On average in the Vectra it should sit about 87°C - ie just below the thermostat opening temperature. The radiator fan should come on around 92°C.

    The reason for this is that engine lubricating oils work best in that temperature range. So the cooling system works to maintain that range.

    If it's running at 80°C or below, you have a failed thermostat.

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