12657629 HEATER 1.152 Fits 2001-2013 Chevrolet Silverado HD with 6.6L Duramax Engine. Fits 2001-2013 GMC Sierra HD with 6.6L Duramax Engine. Replace your old leaking heater with this brand new heater. Heater is 1000 Watt, 120 Volt with 3 prong plug in. FREE SHIPPING