doug c Posted July 19, 2008 Share Posted July 19, 2008 1994 Es300 with 288,000 miles. I have found when buying parts that this was probably a 2003 engine in a 2004 model year, as it was built in november of 2003. Therefore, it has the single hydraulic powered engine fan instead of the twin electric fans later that year. In the hot (80 + Fahrenheit) weather it starts to run hot. If I keep speed to under 70, and AC off, it will run for an hour or so and then start to creep up. Turning the heat on will bring it back down, at which point heat can go off and all is fine again for another 30 or 40 minutes. Any time the AC is turned on the car will go up towards hot...after about 10 or 15 minutes. I have recently flushed the system, and replaced the thermostat. The coolant flushed out looked brand new, the thermostat seemed fine, although while out it was replaced. I find that the upper radiator hose is very hard when the car is warmed up. It returns to normal pressure when it cools off. I don't see any evidence of a head gasket problem. The oil is not milky, there as been no coolant loss, no smoke from the pipe, etc. The heat works fine, so I suspect the water pump is functioning. Any suggestions? Quote Link to comment Share on other sites More sharing options...
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