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Thread: Thermostat change - do i need to bleed?

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    Default Thermostat change - do i need to bleed?

    Planning on changing the thermostat on my 150 and have read that you need to bleed the coolant system after it but I cant seem to find out how this is done. Can anyone enlighten me and possibly point out anything that I need to look out for?

    Do I need to remove the battery? If I do will the radio lose its code?

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    Unknown about the battery, but with the 2.0 DTi I know the cooling system self bleeds. Can usually tell if there is a breather pipe above the return pipe attached to the coolant reservoir.

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    Vehicle : Vauxhall Astra-J

    Trim : Elite

    Engine : 2.0 CDTi

    Year : 2013

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    Quote Originally Posted by Tigger View Post
    Do I need to remove the battery? If I do will the radio lose its code?
    If half canbus, yes. Full canbus, no

    Half can - 6 buttons on the steering wheel.

    full can - 4 buttons and 2 scroll wheels.

    Don't forget to reprogramme the windows. Fully open, then hold button down for approx 5 seconds, then fully close, and hold finger on button for approx 5 seconds. Repeat for the other windows.

    As regard bleeding, any air should return to the header/expansion tank. That's why it's the highest part of the cooling system.

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    Full Member plasma's Avatar
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    Vehicle : Vectra

    Trim : SRi

    Engine : 150

    Year : 05

    Mileage : 74000

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    Will post up the correct bleeding prodedure as stated by the tech guide when i get home tonight....
    Plasma's Tech2 services are now open and able to provide services

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    Cheers for the info on the battery. Mine is full canbus so it is just the windows to deal with. (Wouldnt have guessed that).

    Plasma, appreciate your help.

    Another questions I'm afraid - I see that you lose approx 2.5 litres of coolant. What mix do I put back in? How much Antifreeze to water?

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    Full Member plasma's Avatar
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    Vehicle : Vectra

    Trim : SRi

    Engine : 150

    Year : 05

    Mileage : 74000

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    As promised. Vx guide to cooling.. No need to disconnect battery but on the tech guide it does say to 'remove' the battery altogether to give better access to the spring clips on the hose pipes... although i didnt..

    Important: Vehicles with AC: Switch off air conditioning or with ECC set to ECO Mode (if available)

    1. Open cooling system
    Warning: Cooling system is under pressure.

    • Unscrew the coolant expansion tank cap.


    2. Top up coolant; open bleed screw on coolant distribution pipe until coolant flows out
    • Coolant compensation tank

    Important: If the cooling system (including heater) is completely empty, overfill the coolant compensation tank up to the filler neck and open quick connector in heater feed line (left in direction of travel) and bleed screw of coolant distribution pipe (above exhaust manifold) until coolant flows out.

    • To marking KALT/COLD


    3. Close cooling system
    • Close cover of coolant compensation tank


    4. Start engine and allow to run
    Note: Operate engine with the following cycle 1 x: 30 seconds – 2000 rpm to 2500 rpm, 5 seconds idle speed, 30 seconds – 2000 rpm to 2500 rpm.

    Allow engine to warm up at idle speed until the 1st radiator fan stage is also switched on.

    Operate engine with the cycle above again 1 x

    Cooling system bleeds automatically during engine warm-up phase.

    5. Switch off engine
    • Allow engine to cool


    6. Check coolant level.
    • Coolant compensation tank
    Note: To marking KALT/COLD – top up coolant if necessary


    Lastly, I used a pre-mixed antifreeze so no need to think about it
    Plasma's Tech2 services are now open and able to provide services

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    Good man Plasma, Thanks very much.

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