How do you replace heater core in 1988 Chevy full sizeG20 van?

To replace the heater core in a 1988 Chevy G20 van, first, disconnect the battery and drain the cooling system. Remove the dashboard or lower dash panel to access the heater core housing, which typically involves unscrewing various components and disconnecting electrical connectors. Once exposed, detach the heater core from the housing by removing the mounting screws and disconnecting the inlet and outlet hoses. Install the new heater core by reversing the removal process, ensuring all connections are secure before reassembling the dashboard and refilling the cooling system.