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The biggest worry for me when changing coolant was introducing air into the system and getting an air lock!
The method I used then and still do now, is to carefully drain all the coolant into suitable container.
Then pour it into measuring jug to find out exactly what has come out.
Then put back in exactly that amount.
If you can get it all in, then you?ve no air in the system.
If it doesn?t all go in, then you?ll have to work out how best to bleed out the trapped air.