Never let the recovery bottle level get below the minimum or it will suck air into the engine when it cools off and you get to start the process, from scratch, all over again.
Run the heater on max heat to make sure their are no air pockets in the heater core during warm up. When you can not get any more air out of the bleeder you are done. It could take several cold-hot cycles before you get no air and I like to check it after a while to make sure I got all of the air out.
regards
mech
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