tell me how do they know its got air in it? they flush it and out the door it goes. its also not winter, who's using the heat or giving a crap if it blows hot now? who?! and it will blow hot in summer time if theres ho water int he core or not, wont it?
he would have been a new tread come October, "help, i got no heat."
the thing is here, dont expect so much from a shop, especially a chain shop like this. they dont give a crap, like a pep boys shop, i pass and laugh at them poor suckers who go there..
for the diy guys you can flush, clean and re fill your coolant the right way for 20 bucks at home.