I have a 2001 Mitsubishi Montero LTD with a 3.5 engine. It has 105,000 miles and has always been a good performer. I have maintained it well myself and about 10,000 miles ago I changed the timing belt, plugs, wires, etc. A few weeks ago it started to show hi temp on the gauge. Momentarily it would even bury the needle and then drop back down. I replaced the thermostat and the radiator cap and made sure I eliminated all of the air by bleeding the top screws near the thermostat. I have run the car through many heat/cool cycles and rechecked the bleed screws. It is not losing fluid and I find no more air when I check the bleed screws or the radiator cap. It is somewhat better now but I still get times when the temp slowly rises quite high and then quickly drops back down to normal (like a bad thermostat or an air lock.) Both the thermostat and the radiator cap were aftermarket. Any ideas as to where to go from here?
I have never seen it actually boil over. I had been considering the temp sensor but the gauge does start at cold and when it is running normally it does read in the normal range (which is about 1/2 the time).
have the same problem?
Wednesday, December 10th, 2008 AT 11:18 AM