For the past 2 months my car has been overheating. It will overheat if I am cruising on the highway w/ A/C on. Or if I come to a stop after being driven more than 20miles. It never gets all tha way to tha 'H' but maybe 3/4 of the way over. The thermostat has been changes, a couple of radiator flushes, and a new coolant overflow tank. Both fans work, but tha needle stills goes 3/4 of the way over. Sometimes I do get a faint whiff of burnt coolant tho, not always tho. Should I get my rad cleaned out?? or what other things should I check out??