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Thread: How to Bleed Radiator

  1. #1
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    Default How to Bleed Radiator

    Hope this hasnt been covered before but how do you bleed the radiator on a 1.9 cdti (150)?

    Is it just removing expansion cap
    wait for it to reach normal temp
    then add coolant as required?

    thanks in advance

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    Regular Member Chris SRi's Avatar
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    Remove the coolant cap.
    Turn heaters to hot on fan speed 2
    Rev car to around 2k and wait to reach normal temp.

    Should have blown any trapped air out by then.

    Wait to cool and check coolant level.

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    Moderator & Events Assistant paulhb's Avatar
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    Vehicle : M5

    Trim : Nothing needs adding

    Engine : 5.0 V10

    Year : 07

    Mileage : 37000

    Default

    You could always use the black bleed screw on the silver pipe between the engine and the radiator pack

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    Default

    What Chris sri said

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    Regular Member Das's Avatar
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    Vehicle : Lada

    Trim : Riva

    Engine : 6.0 V12

    Year : 1954

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    Default

    I thought the System on the Vec was self bleeding, the header tank being at the highest point thus any air in the system naturally ends up in the header tank.

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    Vehicle : Vauxhall Astra-J

    Trim : Elite

    Engine : 2.0 CDTi

    Year : 2013

    Default

    Quote Originally Posted by DasArab View Post
    I thought the System on the Vec was self bleeding, the header tank being at the highest point thus any air in the system naturally ends up in the header tank.

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    Regular Member Chris SRi's Avatar
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    Where does it go from the header tank though? Unless the tops off then it can't go anywhere.

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    Regular Member Das's Avatar
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    Default

    In to the air space in the header tank, above the coolant. Any trapped air that's expelled from the coolant would then require further topping up of the coolant, usually the following day when the coolant has cooled.

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    Default

    Quote Originally Posted by Chris SRi View Post
    Where does it go from the header tank though? Unless the tops off then it can't go anywhere.
    As DasArab says - into the airspace.

    Air is fairly easy to compress, hence why there is an air gap in the header tank.

  10. #10
    Regular Member the-wizard's Avatar
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    Vehicle : vectra-c

    Trim : sri

    Engine : cdti

    Year : 2004

    Mileage : 98,000

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    Quote Originally Posted by paulhb View Post
    You could always use the black bleed screw on the silver pipe between the engine and the radiator pack
    This is the correct way as per TIS.
    Attached Images Attached Images
    Last edited by the-wizard; 31st July 2012 at 12:08.

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