my 86 toy tercel starts to over heat after you have driven about 15miles.....WHY?
timing belt, a/c belts, fuses, have been changed!!! boiling out of the plastic container that the antifreeze
goes in.....not hot from radiator!!! have to refill fluids almost daily!!!
Take your car to a different Toyota mechanic asap.
Check your thermostat or remove it and see if the problem still exists. Sounds like it may be stuck closed.