Keep warm air flowing into the cab with the FOUR SEASONS heater core (P/N 96124), a direct-fit replacement for the 1986-1991 Mack MC, 1987-2007 Mack MR, and 2008-2013 Mack MRU. See the Buyer's Guide tab for engine-level fitment. A heater core is a compact radiator inside the HVAC case: hot engine coolant circulates through its aluminum core while the blower pushes air across it, warming the cabin and helping defog the glass. If a leaking or clogged core is the cause of weak heat, a sweet coolant smell, fogged windows, or unexplained coolant loss, this replaces it.
- Aluminum core: built from aluminum for efficient coolant-to-air heat transfer.
- Heavy-duty construction: engineered for durability in demanding service.
- O.E. fit, form & function: designed to match the original for a straightforward install.
- Independently tested: verified for proven quality and performance.
Backed by Four Seasons' decades of mobile A/C experience, this heater core drops in as a reliable replacement for the listed Mack applications.
This part cross-references / interchanges with the following part numbers:
MC1220, 96124, 938073, ZGG710024, ABPN83315210, 9231298, 1715006, 280466, 4379RD105500, 4379RD105500P, RD105500, RDHRD105500P, 6814, 556124, 600042, 76R3300, RD105500P, RF7411083870, 99419, MC12200, 102668, RDT76R3300
