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Thread: Coolant flush out

  
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    toyotacelicagt4's Avatar
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    Question Coolant flush out

    I'm looking at flushing out the coolant system in my astra and was wondering what would be the best way of doing it? I've attempted doing this on my mums bmw 318 and there ended up being a air block in the system.

    So how can I do this properly without getting air trapped in the system?

    Thanks
    1996 Celica GT-Four ST205 Dyno'd @ 302bhp

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    GB's Avatar
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    when youve drained and refilled the system - run the engine for about 5-10 mins with the heaters on full and the expansion tank cap removed.

    This should draw out any air locks - check the level as usual and hopefully roberts ur mothers brother

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    Dont suppose you fancy doing a quick step by step guide for me?
    1996 Celica GT-Four ST205 Dyno'd @ 302bhp

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    Drain old coolant from system

    Replace bottom plug or hose and refill using hose pipe. Remove bottom plug or hose and keep hose going through system.

    Once you are satisfied it is clear and clean, replace the drain plug or the hose you removed and refill with 50/50 water and coolant.

    Leave the cap off the radiator resevoir and let the car idle for about 15 minutes with the heaters on hot and the fan on at 3 or 4.


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    Ffoeg's Avatar
    2170:01:06
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    You might wanna remove the thermostat, and set the heater too hot,

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    Smarty pants!!

    I would leave it in, but Ffoeg is a bit more technically minded than me.

    Taking it out and then having to put it back in might cause another air lock!

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    If you leave it in, the water isn't gonna flush the block out as the thermo will be closed.

    It's better to stick the hose in where the thermostat lives and flush it from there - and flush in the opposite direction to which the water normally flows so it pushes any crap out

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    Heater set hot or cold is irrelevant - Vauxhall have used air-blending heaters for decades!

    The drain tap is at the right hand lower corner of radiator.
    Maintains:- Vectra Design 1.9CDTi
    Drives :- Hyundai Santa Fe


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    The heater controls are irrelevant for bleeding, but not for flushing - you need the valve open

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    dead easy to do
    open the tap on the bottom of the rad i think its RED
    let the water out,flush it out with a hose pipe
    then take the thermostat out of the block an flush that out with a hose pipe
    re fit then fill up

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