Sunday, May 13, 2012

1992 Lexus LS400: Vehicle is Overheating?

The Vehicle overheating problem has many possibilities,that are to be checked and confirmed.

Faulty Thermostat and low coolant are common issues noticed for overheating on many vehicles.So fgirst confirm the Thermostat and coolant level.

If the Coolant is low,then refill the coolant to its exact full level.

Try this test: With the thermostat out of the vehicle does it still build pressure and do you have coolant flow through the radiator tank?

Is it Pushing the Coolant out of the Radiator reservoir Bottle or not.

Also Try this :-----

If you have the engine block full water and started up with the upper radiator hose off does the water pump push water out the upper radiator hose very easily?

By this Procedure the Water should come out of upper hose.
In some cases you will hear minor squealing noise too.


The squealing noise more than likely is the water on the belts. Provided the water pump is pushing water out of the upper radiator hose then this rules out any circulation issue with the water pump. If you have good flow through the radiator then this only leaves an issue with the cylinder head being cracked or the seats for the valves being cracked or the head gasket itself could be leaking. If you are building severe pressure in the cooling system and the hoses get really hard within two or 3 min. of driving time this would confirm the head gasket is leaking. These hot combustion gases push over into the cooling system through the break in the gasket. You typically will not see water and oil mix because that does not normally happen on Toyota head gasket leaks.


BUT if  it's not pushing water out of the upper hose.

The water should come out of the radiator hose Before it goes into the radiator when you initially start it. It will only do this for a second or two until it runs out of water. If you are feeding water into the bottom hose it will continue to pump the water out the top. If you get absolutely no push of water if the block is completely full then something is going on with the impeller on the water pump.


The water pump is driven by the timing belt and if you're going to replace the water pump you should also replace the timing belt. Again I must mention that the impeller on this water pump rarely ever goes bad.

To confirm this remove the water pump,the impeller should come out with water pump,but if the impeller falls off out separately then its faulty impeller,that causing the problem.

This details will help.
Thanks.


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