MarioLexus

mine does the same creepy thing it's a 93 es 300 w/ 192385 miles on it. The coolent is disapearing but not al the time, sometimes it overheats if i drive around for more than 30 min, sometimes not. there is no obvious leak, and when engine is warm there is pressure in the cooling system. I'm in fog here, since I really have no clue what is going on w/ the car. A week is fine, the other week overheats. Besides that the temp sensor that makes the fan kick in is not working although it's been recently replaced., and now the fan is @ maximmum rpm constantly (depending on the rpm of the engine). Any insight on the matter are really appreciated.