OER Parts offers a wide selection of Air Conditioning and Heater Parts for your 1984 GMC C2500 Suburban. OER Parts offers 1984 GMC C2500 Suburban Air Conditioning and Heater Control Panels, 1984 GMC C2500 Suburban Air Conditioning and Heater Knobs, 1984 GMC C2500 Suburban Air Conditioning and Heater Levers and Cables, 1984 GMC C2500 Suburban Air Conditioning and Heater Relays, 1984 GMC C2500 Suburban Air Conditioning and Heater Switches.