Question about 1992 Lexus Ls 400

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My car is running hot, hasn't over heated as of yet. Going to buy thermostat in the morning,will that help me. Also the housing of thermostat has small crack, and is this be the reason as well?

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  • singletonjon May 11, 2010

    is coolant coming out of tha crack ?, are you loosing water(coolant)? does your heater blow hot ? and check your drive belt for the water pump is it good and tight ? anwser this and Ill be able too give you a better anwser



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There are several things to check when your car is running hot.
1. Drain, flush and refill the radiator... flush it with alot of water to clean all the build-up out. If the radiator is plugged, it can be "rodded" where they actually open it up and "rotorooter" the tubes inside.
2. Thermostat and housing can be an issue... if it sticks shut, and if the housing is cracked...change it out.
3. Water pump: if the pump is failing, the coolant won't circulate well enough to cool. Tell-tale sign is coolant leaking out of the small drainhole on the housing of the water pump.
4. If the motor is running rough, you may have a blown head gasket allowing the coolant to enter the cylinder. You can check for foamy oil on the oil dipstick too.

So long answer to a short question... the thermostat may solve your issue, but check everything else as well.

Best of success!

Posted on May 02, 2010


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First, is the overflow bottle filled to the line where it is supposed to be???

Second, need to check that the thermostat isn't stuck shut... follow the big hose from the radiator to the thermostat housing, it should look like this..

remove the hoses, loosen the bolts on the bottom of the housing...remove it and you should see the thermostat.. it will look like this

Take it inside you house, put it in a pan with water covering it, put it on the stove over medium heat...add salt and pepper to taste... errrr I mean... just watch it as the water heats up, and see if it opens, if not replace it with a new one.

even if it opens, try putting the thermostat housing back on the car without the thermostat...hook the hoses up and and start the car, let it run and see if it still over heats, if so...maybe buy some radiator flush and use it per instructions on the bottle.

Also, make sure you are using coolant and not water... most people think coolant is so it won't freeze...and thats wrong, coolant will not freeze...however, it also won't get as hot as water does or as fast.

If none of that works... could be the water pump, most have a seep hole so they start leaking when they are going bad...notice any water dripping under the car anywhere?

Othyer than that, could be a blown head gasket, or a number of other things making the car run hot.... check everything in the order I showed.. it starts at the cheapest fix.

Good Luck!!

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