1991 GMC Topkick Heater Cores
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- gpd®HVAC Heater CoreGMC Topkick 1991, HVAC Heater Core by gpd®. Heater cores transfer heat from the engine's cooling system to the inside of the vehicle. Thermostat housing and water outlets are connections that transfer coolant between the radiator and...Designed to meet/exceed OE fit, form and functionDurability tested on every new design$31.41