GMPartsGiant.com offers the wholesale prices for genuine 2005 Pontiac Montana Base parts. Parts like Auxiliary A/C Evaporator & Blower & Heater Assembly are shipped directly from authorized GM dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 6 Cyl 3.4L. Model Code: 2/SLIDING DOORS, AWD EXT 2/SLIDING DOORS, EXT 2/SLIDING DOORS, SPECIAL 2/SLIDING DOORS.