GMPartsGiant.com offers the wholesale prices for genuine 2021 GMC Savana 3500 parts. Parts like A/C Control Assembly are shipped directly from authorized GM dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 4 Cyl 2.8L Diesel, 6 Cyl 4.3L, 8 Cyl 6.6L. Model Code: 1 TON CARGO SAVANA, 1 TON COMMERCIAL/RV CUTAWAY, 1 TON PASSENGER.