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blow in to the overflow tank while the bleeder is open, car should be off while doing this (after warming up to operating temp). Might need to be done 5+ times depending on how much air is in the system.
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I usually go for the Prestone Extended Life. Maybe be a bit more, but should solve your problems. U want the no phosphates, nitrates, blah ,blah, blah.
I like to use a simple food thermometer in the rad to check if my tstat opens(fan kicks) at right temp.
blow in to the overflow tank while the bleeder is open, car should be off while doing this (after warming up to operating temp). Might need to be done 5+ times depending on how much air is in the system.
haven't read this method yet.
is this with the radiator cap on? And I remove the small line from the radiator and physically blow into it?
is this with the radiator cap on? And I remove the small line from the radiator and physically blow into it?
Yes.
I'm not familiar with the M20 but does it have a bleeder screw? I was having a similar problem with my M30 and as soon as I used the bleeder screw and blew through that pipe I was all good. I mean it did heat up but that was because the air was getting out of the system and when it cooled down I added about another half gallon of water and all good. Also, I use that water that has no minerals in it with bmw coolant and water wetter.
Good luck!
Edit: I know they are completely different engines but is there one like this on the m20?
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