cooling system too hot and presure - Toyota RAV4 Forums
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post #1 of 4 (permalink) Old 02-17-2017, 12:18 PM Thread Starter
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cooling system too hot and presure

hello. I'm from Portugal. I have 3 1st generation RAV4 one of them with 3s-ge the other 2 are 3s-fe. in one of them I'm having a problem: the cooling system is to hot and also pressure, fan works but if start does not end until it stops the car (ar temperature 18ºC). head gasket replaced. head was test and ok. water pump is ok. no thermostat (with new thermostat it is the same). new radiator. disconnect the heating system (for passengers)... any suggestion what is happening? I'm with no ideas... having the same problem in a friends RAV4 that was stoped for some years
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post #2 of 4 (permalink) Old 02-17-2017, 04:45 PM
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Welcome! Does the temperature gauge move into the Hot range while the engine is running? What is the temperature gauge reading when the fan switches on? Does the temperature gauge stay in the Normal range while the fan is working?

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post #3 of 4 (permalink) Old 02-17-2017, 04:55 PM
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Does the check engine light come on? Have you checked for any codes?

Replace the radiator cap with the proper cap, even if it is new it could be bad. You wouldn't believe how many times I've fixed cooling issues with just a new radiator cap. With new caps people get the wrong cap and it won't seal properly, it's the wrong temperature range, or it's just a defective cap.

If work has been done on the cooling system was it "burped"?

How do you know the water pump is good?

How new are your hoses?

Are you using at least a 50% mix of anti-freeze/distilled water?

What about oil pressure? Oil accounts for about 1/3rd of your cooling. If the oil pump isn't working properly it can overheat the engine. It should throw a code on the OBDII.

If you have any water leaks from hoses or expansion plugs, water pump, etc it will not allow the system to cool properly.

You have hoses under the exhaust manifold shield and to the throttle body, are all of those sound?

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post #4 of 4 (permalink) Old 02-22-2017, 05:34 AM Thread Starter
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hello
problem fix.
the temperature gauge was normal. no codes. the hoses were to solid (because of the pressure). trie with 2 caps.
the problem was the thermostat.... in the beginning it was a original not working one, them i remove, yesterday put a new one from blueprint brand (very similar to original).
it is working perfect. this means that 3S-FE and 3S-GE only work properly with a good thermostat.
thanks
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