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( NO ) with the engine cool
It will overheat, unless you can successfully air cool it.
No , it's best to add coolant when the engine is cold
Your car may stall or stop running after idle because of a problem with its fuel or electrical system.
i believe your heater core has died
Your engine should be cold ( to be on the safe side) when adding antifreeze/coolant. i let the car sit overnight and then add it.
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Yes.
when i get out of car the aircon stays on how can i stop it
=To properly flush the antifreeze on a 2002 Yukon you will need a antifreeze vacume system you will need to start the car and have it running turn on all the heating modules to high and have the car reved at about 1.5 r.p.m, or a little higher to activate the vaccume this will start sucking the old antifreeze out. When the radiator is empty{you will know when it is empty because there will be no more antifreeze coming out}you can then fill it up with half and half antifreeze[half water half antifreeze].=
Look for a vacuum leak.
Bad ecm