2005 Sterling Truck L8500 Engine: 8.8L L6 DIESEL; Position: Fan, Alternator and Air Conditioning;. 2006 Sterling Truck L8500 Engine: 8.8L L6 DIESEL; Position: Fan, Alternator and Air Conditioning;. 2007 Sterling Truck L8500 Engine: 8.8L L6 DIESEL; Position: Fan, Alternator and Air Conditioning;.