97 Toyota 4 runner V6 3.4 157,890 miles overheating

1997 TOYOTA 4RUNNER
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This truck start to overheating about 2 weeks ago, has been replace thermostat,radiator, fan clutch and coolant system flushing twice and the truck still overheating, we open the water pump but looks ok.
So let me tell you how it does when the engine is cold you can drive for about half hour with no problem, but after that start raise the temperature until red, i notice something when the truck the fan doesn't blow like when you start the truck it's blows a lot air to the engine that's why we change the fan clutch but still the same.
Tanks for answer. :?
Sep 18, 2007 at 11:45 PM
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2CARPRO JACK
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If you let it sit and idle will it overheat, or just when you are driving? Any obstructions in front of the a/c condensor?
Sep 19, 2007 at 1:46 PM
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Good question, yes it got overheating when you drive, am not sure at idle but yesterday i let it run for about 30 minutes at idle and no overheating after that i went to test drive and my way back it goes to the red(about 25 minutes. Ah no obstruction in the front.
tanks for your time.
Sep 19, 2007 at 11:29 PM
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2CARPRO JACK
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Possibly a flow problem.First have it chemical tested for a blown head gasket to rule that out.You removed the water pump and looked in it? If the back plate comes off, I would be sure the impeller isnt spinning on the shaft of the pump.
Sep 20, 2007 at 7:50 AM
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yes, i did puller out the water pump and check the impeller it was tight unless getting loose when is hot, do you think?, I'm not familiarized with the chemical test for the head gasket can you give me a idea how is that work.
tanks.
Sep 20, 2007 at 6:46 PM
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2CARPRO JACK
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It is a chemical that reacts to exhaust gasses in the cooling system.Slighthly lower the coolant level (coolant cant directly touch the chemical) with the engine completely warmed up a tube is placed on the radiator filler.
Sep 21, 2007 at 7:54 AM
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BUZZSAW
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[quote:5580819fd1="[email protected]"]yes, i did puller out the water pump and check the impeller it was tight unless getting loose when is hot, do you think?, I'm not familiarized with the chemical test for the head gasket can you give me a idea how is that work.
tanks.[/quote:5580819fd1]
head gaskets bad if no coolant loss, toyota may have a open campaing on this call dealer and have VIN ready to give them. if already done once its on you
Sep 21, 2007 at 10:32 PM