NEW HVAC HEATER CORE This is a listing for a brand new replacement HVAC Heater Core(HVAC Heater Core) UAC is the premier aftermarket brand in the industry with over 30 years of experience. Applications: 2015-2015 Kenworth T680 10.8L with Sleeper Unit; 2014-2015 Kenworth T680 11.9L with Sleeper Unit; 2013-2015 Kenworth T680 12.9L with Sleeper Unit; 2013-2015 Kenworth T680 14.9L with Sleeper Unit; OEM and Competitor Interchange: Global Parts Distributors: 8231621 Kenworth: X6998001 MEI: 6960 Omega: 2752660 Trad Automotive: 2430003 TTAC: 6001657 UAC: HT 2189C Technical Specifications: Width (mm): 175.