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its not that hard to do a heater core, its just time consuming, the only thing i can suggest is to get a haynes or chilton repair manual, i'd explain how to do it but i havent done one on mine yet... but i need to.
its usually just about 6 bolts on the heater core box, which is usually under the passenger side of the dash, then 4 bolts on the heater core mounting bracket, disconnect the hoses and its out.
And im not sure if you have to drain the antifreeze out of the radiator, cause im not sure if the S14 is a sealed system or not, but i'd recomend doing it just because it doesnt hurt to change ur antifreeze for the winter.
good luck.
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