How do you replace the heater core on a Chevy Caprice 1990?

To replace the heater core on a 1990 Chevy Caprice, begin by disconnecting the negative battery cable and draining the coolant. Remove the dashboard and any components obstructing access to the heater core, such as the center console and the climate control housing. Disconnect the heater core hoses from the engine bay, then unbolt the heater core from the housing and replace it with the new unit. Reassemble everything in reverse order, refill the coolant, and check for leaks.