not propery at cleaning out a heater core for my 1998 sts.your mechanic may have squart some water through and some dirt came but one time won't comptly make it work, it takes as many of 3 times to propery clean it to flow clear.it could take .i personaly feel that this was not compleated and i want my money back, but after speaking with this service mgr he said it wont happen. so i went to a radiator @ automotive repair and paid the same amount of 176.91 and to 176.38 cadillac of naperville .i will never again use there service if i don't get back this money lost for them not giving me good service.