OER Parts offers a wide selection of Air Conditioning and Heater Parts for your 1972 GMC C15/C1500 Suburban. OER Parts offers 1972 GMC C15/C1500 Suburban Air Conditioning and Heater Control Panels, 1972 GMC C15/C1500 Suburban Air Conditioning and Heater Knobs, 1972 GMC C15/C1500 Suburban Air Conditioning and Heater Levers and Cables, 1972 GMC C15/C1500 Suburban Air Conditioning and Heater Relays, 1972 GMC C15/C1500 Suburban Air Conditioning and Heater Switches.