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This is how I have bled both mine and a friends, you should also make sure the heater tap is turned on and depending on how the bottle fits into the top of th eradiator you may need to either pinch off the overflow hose or take it out of the overflow and hold it above the top of the coke bottle as the coolant may flow into the overflow as well.GMH has a "tool" for doing this. However, it can be replaced by a 2 litre coke bottle with the bottom cut off and some insulation tape wrapped around the bottle filler neck to make it a neat fit in the radiator neck. Stert your motor (cold) and open the bleed valve on top of your thermostat. Simply pour coolant through the coke bottle until no more will go in and no bubbles are coming out of the bleed valve. close the bleed valve, not too tight and make sure you still have a full radiator. replace cap and check that your overflow is at the right level. Done. I posted this a few months ago but I cannot find the op.
Just by the way, if you are constantly losing coolant check for leaks(obvious) if you can't see any get your system pressure tested.
I think the idea here is to post the correct way to do things, it's no extra effort to use a coke bottle or similar and it also makes a good funnelIt has got me stuffed why so many people have trouble with air locks and bleeding the air out of the ecotec engine.I have drained my vs radiator that many times that Ive lost count,and Ive never had trouble,just fill it up again and go.I mentioned about this to a radiator repair bloke one day,and he said that because the bleeder screw is there for holden to connect their bleeder tool to,people think they have to undo it to bleed the air from the cooling system.He said they didnt worry about touching it,they just fill the radiator and thats it.I always used to undo the bleeder a little bit whilst filling the radiator and then just tighten it up again.But then after talking to this guy,I didnt bother with it and I have still never had one problem with having to bleed it because of air locks or whatever.Id just try filling the radiator to the top and also make sure the overflow bottle is at the max level and then recheck the overflow bottle and radiator levels after its been driven or bought up to operating temp and completely cooled down again.This is all I do and it works every time.