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The best way to remove air from the cooling system

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Old 29 November 2022, 06:31 AM
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Hauntednsk
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Question The best way to remove air from the cooling system

Guys,

I just replaced the radiator on m EJ205 and now hot air blows only when on the Max setting, otherwise, blows cold.
I guess there is air in the cooling system. I had a lack of time, so once I replaced the radiator, I just filled the cooling system with the coolant and that is it. Replaced the lower hose some time ago, just filled the coolant and believed that the air came while driving through the valve in the coolant system cap(s).
But this time, the air blows cold, except for Max's setting. I think that a brand new and dry rad had a lot of air which is stuck in the system now.

What would be the best way to remove the air from the cooling system?
Please advise.

THANK YOU!
Old 29 November 2022, 02:29 PM
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forgedmarco
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Originally Posted by Hauntednsk
Guys,

I just replaced the radiator on m EJ205 and now hot air blows only when on the Max setting, otherwise, blows cold.
I guess there is air in the cooling system. I had a lack of time, so once I replaced the radiator, I just filled the cooling system with the coolant and that is it. Replaced the lower hose some time ago, just filled the coolant and believed that the air came while driving through the valve in the coolant system cap(s).
But this time, the air blows cold, except for Max's setting. I think that a brand new and dry rad had a lot of air which is stuck in the system now.

What would be the best way to remove the air from the cooling system?
Please advise.

THANK YOU!


I used a kit like this, fill up to about a third and leave the engine running so the air has chance to escape.

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Old 29 November 2022, 03:38 PM
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Hauntednsk
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Originally Posted by forgedmarco
I used a kit like this, fill up to about a third and leave the engine running so the air has chance to escape.
That is a cool non-spill funnel. Based on your experience, how long did it take to idle and let the air escape?
Old 29 November 2022, 04:12 PM
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forgedmarco
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Originally Posted by Hauntednsk
That is a cool non-spill funnel. Based on your experience, how long did it take to idle and let the air escape?
probably around half an hour, heater on hot and on a low speed.
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Old 06 December 2022, 07:39 PM
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alcazar
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Best to drain it and refill s l o w l y via a funnel stuffed down the rearmost pipe taken off its fitting on the header tank.
Take your time and don't let it glug.
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Old 06 December 2022, 08:11 PM
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Hauntednsk
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Originally Posted by alcazar
Best to drain it and refill s l o w l y via a funnel stuffed down the rearmost pipe taken off its fitting on the header tank.
Take your time and don't let it glug.
Thanks.

Actually, I bleed out the air using a no-spill funnel as it was advised above.
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