Question about 1994 Toyota 4Runner

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My 94 4Runner overheated for the first time ever, I changed the thermostat, replaced the water pump gasket, and refilled the rad. Coolant seems to be leaking from somewhere lower and vehicle still overheats after 10 minutes idling. How do I solve this?

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  • 40pounder Jul 05, 2010

    Well, the clutch fan works fine, comes on, shuts off, no water in oil, or oil in water, where san it be leaking from when water pump and thermo housing are confirmed sealed? Seems to be lower and further back by an inch or so. Also, it seems to stop after about 7 mins. Then overheats rapidly.

  • 40pounder Jul 05, 2010

    I'll take it in for a pressure test to localise the leak, thank you for the help

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There are many possibilities for car overheating. But as per what you have mentioned in your question ,You have ruled out most of the possibilities by replacing the possible parts for overheating. But one thing is very common that coolant is leaking.And this is the reason of car overheating.If coolant is leaking then you replace all parts the car will overheat till the coolant leak is not stopped. It must be leaking from under the valve cover.''the timing cover is leaking coolant''--engines water pump is behind the cover and it is failing.Other possible location from where coolant can leak are, timing gasket $40, valve cover gasket $140, oil pan gasket set $70, and coolant flush pan. It has to be checked at every location and the leak has to be stopped.Also you can get the coolant pressure test done.With that the exact position of the leak will be identified.At local car auto stores they conduct coolant pressure test.Its not too costly. Thanks. Keep updated for any more query. You can rate this solution and show your appreciation.

Posted on Jul 05, 2010

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First, replace the fan clutch and have the timing set to correct specification. Look for oil in the water or water in the oil. If you find oil or water in the wrong place then you will need to replace the head gasket. Have your mechanic do a leak down test to be sure it is a head gasket problem

Posted on Jul 05, 2010

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