Question about 1992 Lexus Es 300

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Over heating i hear a boiling sound around my therm housing and around the waterpump whats the problem??? and its leeking fluid?????

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If it's leaking fluid around the water pump you have to replace the water pump. They do not last forever. The reason it's overheating is because you have losted fluid. Do not operate without filling the radiator back to normal. You can destroy the engine by overheating and warping the header !

Posted on Apr 12, 2009

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My antifreeze keeps running out.Changed thermostat and it keeps evaporating or running out. What should I check next?


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Could be that fan is not kicking on. check and make sure it is connected. could also be a vapor lock. some cars require bleeding water system and if so most bleeding screws are located around thermostat housing. Call local autozone and ask if your car requires bleeding water system....NOW the overheating could be from fan not kicking on and the best way to find out is to turn on defrost and if fan is working it will kick on automaticaly. If it does kick on then this shows that fan is working fine but this does not mean that fan is running properly.The fan is controlled by a heat sensor which kicks the fan on when motor reaches a curtain heat range. If this sensor is not working it will cause car to overheat.... Could be also that waterpump is bad.Not all waterpumps leak when they go bad.Sometimes the impeler on the waterpump which is what moves water through the system simply stops working and this would cuase it to overheat.......hope this info helps and good luck...Please rate my post and if you need more info fill free to contact me...Need to find where leak is coming from also for this is more than likely the problem........

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Check the over flow tank located in front of the passenger side glove box for water or fluid. When driving the car, listen by the glove box to see if you car hear a boiling sound. If you can hear water boiling or moving, check your heater core to make sure it is not plugged or bad. When the car starts to over heat, does the gauge register that it is getting hot? If it doesn't then check the thermostat to make sure it is not stuck open or closed. If its over heating and the gauge is not showing that the car is running hot before boiling over, then the thermostat is defective or not working. Try replacing it again.

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Could be water pump does the electric fan cycle on off while the car is idling??? Could be the electric fan or the electric fan temp cycle sensor as well?
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If it is leaking out of the radiator cap, then that means you need a new radiator cap. Your cooling system in your car is a sealed system. Sounds like your radiator cap is not sealing properly and when the cooling system is not longer sealed then the temperatures cause the coolant to boil whereas coolant not subject to the atmosphere does not boil. Start there.

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Did you "bleed" the air from the system after replacing the thermostat housing? On some GM vehicles, there is a brass "bolt" threaded into the housing. Some models will develop an air-lock, which prevents the fluid from filling all of the coolant cavities causing "cavitation" - which can lead to an overheat condition. If you can find the brass bolt (usually located on the thermo housing, but sometimes on the waterpump hose assembly, remove it while the engine is warming up. As soon as air bubbles cease coming out and a steady coolant flow is seen, re-insert the brass bolt.

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