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Changed thermostat on 1990 toyota 4 runner v 6 still willnot reach operating temp.
Took coolant block off i n back of motor ,cleaned it out replaced sensors,,replaced thermostat, still willnot reach operating temp for transmission to shift into overdrive.pull on side of road cut off,let sit few minutes ,ok reach normal, few miles down road starts cooling off ,kicks out of o.d. again
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first check radiator level if it is full and the heater is working good make sure temp gauge is functioning c orrectly it is most likely the coolant temp sensor but if this is a high milage vehicle and you have owned long time and never changed i would also replace thermostat and check plug to temp sensor forr good conections and good wires
no power or no ground ??
try running a hot line to the motor
run a pair of wires from the batterie 1 pos 1 neg speaker wire will do
unplug the window motor and run it direct pos on 1 wire neg on the other flip the wires to change motor direction
if motor works then it's eithor a bad ground or a bad wire or a bad reley
Hope you didn't run your car much when it overheated. this could mean trouble if you did. But as suggested, replace the thermostat.drain the coolant if it has any left, below the thermostat level. It is located at the end of one of the radiator hoses . the housing has a bleeder screw at the outlet of the housing. then remove the housing. the thermostat is located underneath. be careful to replace it the same direction. Clean the contact points on the engine and the housing.And place a little bit of silicone gasket sealer on the gasket and the housing . Make sure the thermostat is settled on the engine part. Carefully replace the housing. And reinstall everything back. refill with coolant half/half water and coolant.Start the car and let it heat up. Then bleed the system with the bleeder screw turning it counter clockwise until all that comes out is coolant. refill radiator again and repeat. Until radiator is full.
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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