Part Type: HVAC Heater Core. 1973 GMC K25/K2500 Suburban Engine: 4.1L L6 OHV; EngineVIN: Q; FuelSystem: 1BBL; with A/C;. 1973 GMC K25/K2500 Suburban Engine: 4.8L L6 OHV; EngineVIN: T; FuelSystem: 1BBL; with A/C;.
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