How do you remove heater core on 1971 Buick Skylark?

To remove the heater core from a 1971 Buick Skylark, first, drain the coolant from the radiator. Then, disconnect the heater hoses from the core, followed by removing the dashboard and the heater box assembly, which may require unbolting various components. Once the heater box is accessible, unfasten the screws or clips holding the heater core in place, and carefully pull it out. Be sure to reverse the steps for reinstallation, ensuring all seals are secure to prevent leaks.