What causes my Toyota Corolla 2E engine to overheat intermittently?

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theats7

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Ive done checking, everything looks o.k, pump,hoses, fan, radiator and with no leak.

What bothers me thou is when I disconnect the upper hose going to the radiator flow of water is too little or nothing at all but when I rev it its seems to have enough flow. And again at idle rev no flow. Educate me on this please.
Ive done checking and all seems o.k.. radiator, water pump, hosses, fan motor, and without leak.

What bothers me thou is that when I disconnect the upper hose I see very little flow at low rpm and with good flow at high rpm.

Please educate me more on t his.
Ive done checking and all seems o.k.. radiator, water pump, hosses, fan motor, and without leak.

What bothers me thou is that when I disconnect the upper hose I see very little flow at low rpm and with good flow at high rpm.

Please educate me more on t his.
radiator bubbles not, impellers all intack, radiator has excellent water flow
 
Internal damage to the waterpump perhaps. One of the impeller blades is damaged? I have seen pumps come apart inside.


on a side note:
Did you perform a block test on the engine to make sure you dont have a problem with the head gasket?
 
well the themostat can restrick flow until the engine is hot, thats one cause. another is this engine can get air bubbles in the cooling system easy due to the way the system is set up. If its not the thermostat then your getting air bubbles in the system, you have to close the system and there should be a bleeder valve on it some where. but if not fill it as full as you can then close it and make sure the over flow tank is to the full mark .and try again.
 
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