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Re: Heater Core???
1)The heater core , good or bad, will have no effect on the car over heating. There are other cooling system issues to be addressed concerning this such as dirty clogged radiator cores, improper water / coolant mix ratio, faulty radiator cap, poor water pump performance, leaves and debris, or bent fins on the radiator or condensor core obstructing air flow thru the radiator and a/c condensor & ect., missing air dam, inoperative cooling fan, bad fan switch or relay............................................. ...........................
2) yes the heater core can leak even if you never use it.
3) hot feet on passenger side could be a stuck or inoperative blend door.
another possibility is a missing heat shield over the Cat Converter or an improperly tuned / timed engine causing excessive Converter and exhaust temps.
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