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To replace the heater core on a 1999 Oldsmobile Intrigue with a 3.8L engine, first, disconnect the battery and drain the coolant. Then, remove the dashboard and the HVAC assembly to access the heater core. Disconnect the hoses from the heater core, remove any retaining screws or clips, and replace the old core with the new one. Reassemble everything in reverse order, refill the coolant, and check for leaks before reconnecting the battery.

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1mo ago

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