my 1993 toyota four runner runs great. my only problem is the temperature gauge stays about in the middle almost all the time with the exception of when i go up a reasonably steep incline. the engine then heats up to the red in less than an 1/4 of a mile. as i crest the hill and start down the hill it cools reaasonably quick as long as i keep the idle up. the radiator is brand new and the coolant is not leaking out. it only overheats when going up an incline. thanks to all.