1992 Lexus ES300 Overheats Fast
Does it overheat relaly fast, or does it slowy get hotter and hotter? If it is really fast, and the thermostat has been replaced, I would suspect a bad water pump, or an obstruction stopping water flow.
They make a flush'n fill kit from prestone that has adapters to install in the heater core hose that flushes the system. With the radiator hose disconnected at the thermostat, and the thermostat removed, when you apply water pressure to this adapter, you should get water flow from both directions. If one is not flowing, track down the obstruction. If the water flows both ways, I would suspect a bad water pump.
Make sure after servicing, you bleed the air from the system thru the bleed port.
Does it overheat relaly fast, or does it slowy get hotter and hotter? If it is really fast, and the thermostat has been replaced, I would suspect a bad water pump, or an obstruction stopping water flow.
They make a flush'n fill kit from prestone that has adapters to install in the heater core hose that flushes the system. With the radiator hose disconnected at the thermostat, and the thermostat removed, when you apply water pressure to this adapter, you should get water flow from both directions. If one is not flowing, track down the obstruction. If the water flows both ways, I would suspect a bad water pump.
Make sure after servicing, you bleed the air from the system thru the bleed port.[/quote]
THANKS! It does get hot really fast! Thankyou Thankyou for your help!!
Suggested Repair
Because it overheats very quickly after the thermostat was replaced, check for a failed water pump or a blockage restricting coolant flow. With the thermostat removed, flush through the heater hose and confirm water flows both ways; if flow is good both ways, suspect the water pump. After service, bleed air through the bleed port.
Conversation Summary
A 1992 Lexus ES300 with about 160,000 miles overheated, lost power, and steamed after a drive, with a melted T-connector near the overflow. The owner replaced the connector and thermostat, added water, and burped the system, but it still got hot very quickly. The expert said rapid overheating points to a bad water pump or an obstruction, and recommended a flush-and-fill check of flow in both directions plus bleeding air. A later post asked where the thermostat is located but received no reply.
