OER Parts offers a wide selection of Heater Parts for your 1994 GMC All Models. OER Parts offers 1994 GMC All Models Expansion Valve, 1994 GMC All Models Hose Clamps, 1994 GMC All Models Hose Fittings, 1994 GMC All Models Hoses and Lines, 1994 GMC All Models Vent and Duct Parts.