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the nuts holding the heater core box is in the engine compartment. the wheelwell needs to be removed to access the nuts. once all the nuts are removed, remove the heater hoses from the firewall and then wiggle out the heater box, but be careful of the cables and wiring. lower the box and remove the cables from the levers and the wiring from the heater resistor pack. remove heater core and reinstall

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Q: How do you replace a heater core in a 66 Chevelle?
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