How do you Replace a heater core in 1992 300e And where is it located?

To replace the heater core in a 1992 Mercedes-Benz 300E, first, drain the coolant and disconnect the battery. The heater core is located behind the dashboard on the passenger side, requiring you to remove the dashboard and potentially the center console for access. Once you access the heater core, disconnect the inlet and outlet hoses, remove any retaining screws, and replace it with the new unit before reassembling everything. Remember to refill the coolant and bleed the system to remove any air pockets.