Question about 1986 Toyota 4Runner

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1986 Toyota 4Runner Oil in the radiator

Oil in the Radiator, just a bit. Truck over heated at minus 10 in like 15 minutes Has a new T- stat . also has small leak in radiator. No Anti Freeze in the oil . There was only 2 1/2 Quarts of oil in the engine

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Could be head gasket

Posted on Dec 25, 2008

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4runner still over heating change water pump and t stat


better check radiator cooling fan clutch if fan turning slow at idle then fan clutch is bad .

Mar 19, 2014 | 1998 Toyota 4Runner

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93 4runner new radiator new t stat still overheating.


Check:

1. Thermostat. Replace with an OEM one from the dealer. 2. Radiator. Make sure it's not plugged up. 3. Radiator Cap. There cheap from the dealer and I consider them a maint. item. 4. Water pump. How many miles are on it? 5. Fan Clutch. Make sure it has some resistance
6. Temp. Sensor for the gage.Have you checked that the electric cooling fan is turning on when the engine reaches operating temp? A faulty coolant temperature sensor will not trigger the fan, or the fan itself or fan relay could be shot. You might also have a head gasket leak that is not into the cylinders, so it would overheat without causing milky oil. Another possibility is a clogged radiator -- with 15 years on the vehicle, it's quite possible. Have the cooling system pressure checked, and replace the radiator cap for starters -- if the radiator cap isn't holding pressure, overheating will occur rapidly.

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1990 toyota 4runner over heating imetiatly new thermostat heater will not blow hot air doese not leak antifreze only steams


Since you have a new thermostat installed and no heat and overheatingyou have one of two or a combination of problems. You either have a bad water pump or a clogged radiator. The radiator can be flow checked at a radiator shop, if it flow checks fine replace the water pump. The pump may not have play in it indicating it is bad, but the shaft inside cold be broken so that the fan turns and the pulley turns on the outside but not internally where it counts.

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i think its going to be the head gasket duto the way its leaking coolant. one of the water jackets maybe i would have it checked to be sure but it sounds like head gasket

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Overheating


Put in a t-stat. No thermostat can act like a bad thermostat, causing over heating, i too have a 94, it was clacking eradically, turns out it was the t-stat opening and closing about 60 times a minute, so i took it out, it got hot, put a new one in, and no more issues.

Jan 16, 2009 | 1995 Toyota 4Runner

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The information provided by Toyota Joe was extemely helpful and I would like to convey my appreciation for his assistance. Thank you Toyota Joe!

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97 toyota 4runner


Sounds like your heater coil could be clogged. Its a small radiator like device that hot coolant is pumped through to heat the cabin. its very small so clogging is pretty likely.

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