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Take the thermostat out. Reinstall outlet, run a hose thru the upper hose and let it drain out the lower... replace the radiator. And ur heatcore will be destroyed. Ive had sucess using generic coolant flush liquid, but no lie on a friends civic he ran water and 2 bottles of CLR. drove it around about 5miles and then flushed it all.
I had a motor that sat for years and the coolant ate away the block to the point it destroyed a cylinder sleeve....
Ur gonna be replacing, radiator, water pump, tbermostate, heater core, all the hoses and freeze plugs. That motor is fukkd
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