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To remove and replace the heater core on a 1968 Pontiac Tempest, start by disconnecting the battery and draining the cooling system. Remove the heater hoses from the core, then take out the dashboard or access panel to reach the heater box. Unbolt the heater core from the box, replace it with the new core, and reassemble in the reverse order. Finally, refill the cooling system and check for leaks.

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4mo ago

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