Question about Toyota 4Runner

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4 Runner 1994. Auto transmission. A/T Oil Temp light comes on every time I drive past 70 mph on HWY. If driving below 70 mph it doesn't come on. I had the transmission oil flushed in shop lately and light still come on the same. Water pump just changed as well. Engine temp very stable - needle in center always - Now, I just found out that there's a few tiny holes on top of my radiator. Bit of engine coolant leaking out. Level of engine coolant still at max. Could that be related to my A/T Oil Temp light coming on? Anyhow, I'd like to figure out why the light come on and what to do about it. Also, should I change my radiator or is there an cheaper fix to clog the holes? I just found out that even cold my coolant liquid was gushing out of the rad when I removed the cap to check the level of coolant. Also I pulled the transmission oil stick and noticed that the level was well above the cool line - even well past the hot line. Does that help explaining part of the problem with the A/T Oil Temp light?

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  • TONY LAVICTOIRE Jul 28, 2010

    Thanks for your input kapishtech. 4 thumbs up!

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This light is the indication of engine getting overheat. it may indicate that the automatic transmission fluid is too hot.And yes if the coolant is leaking the car engine will get overheat.or if in-case the engine is not getting overheat then other parts like thermostat,oil temp,temp sensor this gets command to show error.Mostly the radiator hole repair will help to resolve the problem.Check all the things the radiator cap the radiator hoses and seal the hole so that the pressure gets created and not get released.As this hole in radiator is related to the oil temp light coming,but if resolving the radiator part does not solves the actual problem then the coolant line,coolant temperature sensor has to be checked. .If all the above mentioned possibilities checked out OK. Then Get the car scanned at diagnosis center. If the problem repeats again n again then its advisable to get car scanned at diagnosis center to get error codes, At diagnosis center you will receive the error code.As per the error code it will detect the exact faulty part in the car due to which the problem is occurring.For more help :--- at www.autozone.com its absolutely free to get car scanned.
Thanks. keep updated for any more query.you can rate this solution and show your appreciation.

Posted on Jul 28, 2010

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