I've had two crossfire's overheat and the cause on both was always the exact same thing a failed cooling fan. The failure rate on the MB 3.2 engine cooling fan is high from experience and they squeak to get your attention that they are about to go, once they replaced the cooling fan problem was fixed and the coolant light went out.

What computer are you talking about to solve a over heating problem??? Don't tell them to look where they are not supposed to, have them replace the cooling fan.