85 toyota celica

let's see. a friend of mine has a 85 celica, & he claims that the car overheats upon driving on the freeway. it doesn't happen while in traffic. we changed the water pump, thermostat, hoses. any ideas?

change the rad fluid

[76 Mustang II]

Try flushing the cooling system, and checking the fan wiring, sensors etc...

If the radiator is original, its probably time for a new one..

water flow is ok, & changed the radiator, thermostat, water pump, & flushed system

[thecarguy]

head gasket(s)?

Pressure test the system,may find block or head leakage. Check engine timing.