OER Parts offers a wide selection of Heater Parts for your 1992 GMC All Models. OER Parts offers 1992 GMC All Models Expansion Valve, 1992 GMC All Models Hose Clamps, 1992 GMC All Models Hose Fittings, 1992 GMC All Models Hoses and Lines, 1992 GMC All Models Vent and Duct Parts.