OER Parts offers a wide selection of Heater Parts for your 2006 GMC All Models. OER Parts offers 2006 GMC All Models Expansion Valve, 2006 GMC All Models Hose Clamps, 2006 GMC All Models Hose Fittings, 2006 GMC All Models Hoses and Lines, 2006 GMC All Models Vent and Duct Parts.