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R reg toyota previa over heats. had new pressure cap n tested the head gasket so both of them are fine. is it likely to be the water pump? as its worse wen Im startin n stopping but seems fine wen Im driving even if I drive her hard

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Hello. It's good you test some things first. Yes it can be the water pump, but it could also be the radiator getting bad. Test the water pump and the radiator just to be sure and safe. It also could be a clagging problem insome of the water tubes for the water pump or radiator. Good Luck.

Posted on May 15, 2014

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It appears that you have a viscous fan hub driving the fan or should I say failing to drive the fan. The fix is to replace it . If you have electric fans then there is a problem in the temp sensor system and the fans are not cutting in on temperature The problem you state is indicated by the fact that when driving there is sufficient air through the radiator to remove the heat from the radiator ..but when driving slow there is no air flow because the fan is not drawing air through the radiator and the temperature climbs until over heat is reached . Typical indicators of fan speed problem is overheating at stop sign/lights, slow heavy traffic driving, slow up hill driving, and rapid cool down as road speed is increased , the faster the speed the cooler the motor

Posted on May 15, 2014

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hi, it sounds like the head gasket has gone take out the spark plugs and check for signs of water also check the oil for signs of water as this to me looks and sounds like the head gasket has failed and will need replacing.

If water is not present then try starting the car with the coolant filler cap off and see if it starts if it does then this is head gasket failure if it still dont start then your going to need to get a compression test done and then this will tell you if the gasket is good or bad but to me it sounds like head gasket failure.

If the gasket needs replacing then you need to also check the water pump is working and also test the thermostat as any of these failing can cause the head gasket to blow again so make sure you get these checked ok.

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Nope you have a shot head gasket or a cracked block

Fill the radiator with water and run the engine with the filler cap off

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You can try the liquid cooling system repairs from Holts such as Radweld or there is a powder called Ce-lit

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The head needs to come off be skimmed and pressure tested

If it passes that then it is a new gasket and a re-build

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