I have a 91 mustang previous owner dumped in a whole bunch of the stop goo in the radiator clogged the whole system up. Took the car to get back flushed car has new upgrades 3 row radiator, new hoses, new thermostat, new sensor, new fan clutch. Previous owner has receipt of water pump being replaced but that is the only thing left in our cooling system. The car runs fine when driving in city runs below middle. I take my car around 45 miles away from house runs fine out there gets a little...

91 mustang overheating issue