How do you replace heater core on a 1996 Audi cabriolet?

To replace the heater core on a 1996 Audi Cabriolet, first, drain the coolant and remove the dashboard for access. Disconnect the heater core hoses from the firewall and unbolt the heater core from its housing. Install the new heater core, reattach the hoses, and reassemble the dashboard before refilling the coolant and checking for leaks. Always consult a repair manual for specific details and safety precautions.