Question about Toyota 4Runner

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My son is towing a 6x12' trailer with a 2004 toyota 4runner and he has gone about 500 miles and now the truck is starting to overheat. I replace the radiator, fan clutch, and thermostat beofrre he left but NOT the water pump. Is there a quick test he can run to determine what is not working. If it is the pump how hard are they tto change or what would be a going rate to change the pump?

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  • lstappeal May 07, 2010

    He is going to check what yu said but I am wondering if the water pump is bad. I would guess that if the water is circulating when he looks in then the pump is working. Would a seperate tranny cooler help drop the enginge temp?




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I would tell him to check the coolant first. Slowly remove the cap, start the car, and check the level with the heat on full blast! Have him note whether there appears to be any contaminants in the water/coolant such as oil. If nothing "appears" to wrong add some more coolant until full. He can try running with the heat on full and see if that helps drop the temperature. If it does, it may be too much of a load and too small of a trans cooler. Let me know what he sees. I will be here for a while and happy to help!

Posted on May 07, 2010

  • Kori Policy
    Kori Policy May 07, 2010

    YES! Yes it would because it would put a seperate radiator on the outside of the actuall radiator to help disapate heat. It would also keep the transmission temp out of the coolant temp. The stock coolers are usually in the bottom or side of the radiators or if they external they are minimum. Have him check and add to the level and then run with the heat turned on. If this makes a noticeable improvement, the water pump is fine.



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