Fiesta Overheating Sporadically
Hi, I have a 99 Fiesta which is overheating sporadically when I am driving. I can go on a long drive(1.5 hours) without the car overheating and then do the same journey again and it will overheat. Coolant levels are OK. Tried clearing any air lock to no avail. Could the Thermostat be stopping working intermittently. The mechanic checked it and said it looked ok? Any help/suggestions much appreciated.