1990 GMC Topkick Heater Cores
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- gpd®HVAC Heater CoreGMC Topkick 6.0L / 6.6L / 7.0L without A/C 1990, 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...Designed to meet/exceed OE fit, form and functionDurability tested on every new design$31.41