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air trapped in cooling system. Loosen cap, cold engine, fill rad & res. run engine at 2500 rpms to spin pump fast and it will purge out rad cap. tighten cap and keep res full until engine cools down and sucks coolant into rad.
Many cars don't have a drain plug, and even if there was one, I wouldn't touch it, because they often break or strip out. Simply remove the lower rad hose from the radiator, and let the coolant drain out. Then, leaving the hose disconnected, remove the heater hose leading to the engine at the engine intake manifold end. Shove a garden hose into the end of the heater hose, and flush thoroughly with water until the stuff running out of the lower rad hose runs clear. Then, reconnect both hoses, and slowly pour in a gallon of pure coolant (not 50/50), as it will mix with the water left in the engine block. When the rad is full or nearly full, start vehicle and, leaving rad cap off, allow it to reach operating temp (upper rad hose will get hot, and coolant level in rad will drop). With engine idling, (important!) VERY SLOWLY pour the rest of the coolant in, and any additional coolant mixed 50/50 with water, until the rad is full. Cap it, and then fill the overflow bottle to the FULL HOT mark, or close to the top if no mark is found. You're done!
if there is no thermostat in the engine and the cooling system is full and no air in the system then you could have a water pump impeller that is not circulating the coolant,a rad flow problem, or a head gasket problem.
check trasmisson fluild level if it is full check to see if it ssmells burnt if it smells like onions and is brrown then the filter may be plugged and the fluid is burned so you will have to replace it. however most likely it needs to be rebuilt snd tork converter replaced. hope this helps.
check your thermostat and water pump, also check if there is any water or coolant in your rad and overflow bottle at all, rad should be full and overflow bottle should be half full
If tranny fluid is present in the antifreeze, you need a new radiator as there would be a crack in the trans cooler that is within one of the radiators tanks.
Not sure about the 4 runner's cooling system, but if there is airlock I usually take the coolant back out, take the thermostat back out, fill the engine block from this hole with 50/50 coolant, reinstall the thermostat, upper hose, fill the radiator and tank, then run the vehicle with the heater on max (rad cap off) and then fill the rad as the rest of the air comes out.
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