OER Parts offers a wide selection of Heater Parts for your 1965 GMC 1000 Series. OER Parts offers 1965 GMC 1000 Series Blower Motor, 1965 GMC 1000 Series Heater Box, 1965 GMC 1000 Series Heater Control Valves, 1965 GMC 1000 Series Heater Cores. 1965 GMC 1000 Series Hoses and Parts, 1965 GMC 1000 Series Vent and Duct Parts.