Mercedes 300D Heater Cores Price $299.00 Prev Next Product Description Did you spend the last 10-15 hours dismantling your Mercedes dash to get at the heater core? No plastic and aluminum flanges on ours. We built our 300D Mercedes heater core from copper and brass and did it right here in the USA. Better for heat exchange. Not prone to corrosion from electrolysis like the aluminum heater cores these are built to last. If you need another heater core core for a different year or model ...You may mail your contact information, the heater core and assembly to: The Brassworks 500 Linne Road - Unit I Paso Robles, CA 93446 Email email@example.com when shipping the heater core so we know its in route. You may also fax a drawing with dimensions to 805-239-2545 to get the process started.