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I am looking at a 4 runner that is for sale. It has a overheating issue. The cooling system has been pressure tested,
heat cores replaced, new radiator, head gasket....ect. It overheats slowly, and will cool when the heater is turned on for a moment then the temp. will begin to rise again? What do you mechanics think?
Thanks.
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I assume you replaced the thermostat ?
Jed York does not own the 49ers; Russell Wilson does.
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it is a '97 SR5. All the obvious solutions have had new parts thrown at it but no fix.
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yes, thermostat has been replaced.
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No. Would that cause overheating? Thanks.
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Blinker Fluid? 
Deal with it.
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Blinker Fluid? Yup! I also replaced my muffler bearings  It still overheats.........
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Well then, I just couldn't tell ya. Seems like everytime I take the car in my muffler bearings are shot and I'm a quart low on blinker fluid. 
Deal with it.
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4 banger or V6?
Could be the water pump is starting to go south, or a problem with the head gasket.
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Water pump blades worn down or broken off, foreign object stuck in a water passage, the timing is too far advanced.
Best I can come up with.
Mike
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4 banger or V6?
Could be the water pump is starting to go south, or a problem with the head gasket. Both have been replaced.
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Air dam blocked? Bumper grease low? You might need to replace the rims with 28 inchers, mo betta air flow under the cab.
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Unless you want a fixer upper, I'd walk from it. Just because the parts were replaced, doesn't mean they were replaced properly. If the head(s) were warped and not ground flat, even with a new head gasket you can be getting combustion products into the cooling system.
Either that or the coolant system just isn't flowing properly and there are obstructions somewhere in the system.
I'm learning to loathe working on vehicles, so I'd say just keep looking, you should be able to find a runner w/o signifigant problems and it would be worth paying a bit more for a car w/o problems.
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was the radiator cap replaced? I had that happen to me before, and it was a slow climb on the temp till it red lined.
NEVER ARGUE WITH AN IDIOT. THEY WILL DRAG YOU DOWN TO THEIR LEVEL AND BEAT YOU WITH EXPERIENCE!
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Unless you want a fixer upper, I'd walk from it. Just because the parts were replaced, doesn't mean they were replaced properly. If the head(s) were warped and not ground flat, even with a new head gasket you can be getting combustion products into the cooling system.
Either that or the coolant system just isn't flowing properly and there are obstructions somewhere in the system.
I'm learning to loathe working on vehicles, so I'd say just keep looking, you should be able to find a runner w/o signifigant problems and it would be worth paying a bit more for a car w/o problems. The heads were re-surfaced. Thanks for the info 458 Lott!
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Unless you want a fixer upper, I'd walk from it. Just because the parts were replaced, doesn't mean they were replaced properly. If the head(s) were warped and not ground flat, even with a new head gasket you can be getting combustion products into the cooling system.
Either that or the coolant system just isn't flowing properly and there are obstructions somewhere in the system.
I'm learning to loathe working on vehicles, so I'd say just keep looking, you should be able to find a runner w/o signifigant problems and it would be worth paying a bit more for a car w/o problems. Is there a way to check for proper flow? Maybe pulling the return hose and check to see if coolant is moving fast? I dont know.
Last edited by fester; 07/08/10.
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No. Would that cause overheating? Thanks. yes,I have seen several toyotas that the intake manifold leaks,and the engine slowly overheats.Try spraying starting fluid around the intake gasket when the engine is running.If the engine revs up,the gasket is leaking.Or maybe its a muffler bearing.
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