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O2 sensor has nothing to do with engine overheating. Are you losing coolant? Did you bleed all the air out of the cooling system after replacing radiator? Have you checked the coolant for exhaust gas byproducts? You may have a bad head gasket, or a cracked block/head if you ran the car for an extended period while overheated.
check the following: 1.radiator fan motor and fuse for operation. 2. run cooling system pressure test for head gasket, hoses, water pump leaks. 3. pressure test radiator cap. If all tests pass, flush radiator with coolant flush or citric acid for 33-45 minutes
Assuming you have enough coolant in the car, try a new radiator cap first. If that doesn't fix it try changing the thermostat and seal.
If it only happens with the a/c on at low speeds the aux cooling fan is bad. There is a low speed fan and high speed fan depending on how hot the motor is. Both turn off at speeds higher than 35mph.
If it happens without the a/c it could be bad water pump, radiator fan or a cracked head. Cracked head could allow steam leaking into the intake causing misfire. Overheating problems
They did not do there job, they should of block check the engine also what about the radiator is it plugged or the waterpump they fail on the inside as the propellor is plastic. Becareful your engine can blow a head gasket blows easy
You may not need an engine depending on how long you drove it overheated. if your engine is not knocking or rapping it may be saveable. check with auto parts stores that resurface engine heads if haveing resurfaced have the head checked for cracks. if you need an engine check your local junk yard for a low milage wreck or look in ebay.
if all the fans are working then it maybe a crack head did you get them check when you put new gaskets on. could be a hairline crack. that cant be seen unless it magnafluxed.
White oil means water or coolant is leaking in via Head Gasket Failure or a crack in the head.
Along with repair - be sure to have each cylinder compression tested to see if there is a crack that has developed.
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