How do you replace a heater core on a GMC Typhoon?

To replace the heater core on a GMC Typhoon, first, disconnect the negative battery cable and drain the coolant from the radiator. Remove the dashboard and other components obstructing access to the heater core, then disconnect the hoses and any electrical connections. Carefully extract the old heater core and install the new one, ensuring all connections are secure before reassembling the dashboard and refilling the cooling system. Finally, check for leaks and ensure proper operation of the heating system.