For 1973-1974 Chevrolet P20 Van HVAC Heater Core UAC

1973 Chevrolet P20 Van Engine: 4.1L L6 OHV; EngineVIN: Q; FuelSystem: 1BBL; with A/C;. 1973 Chevrolet P20 Van Engine: 4.8L L6; EngineVIN: T; with A/C;. 1973 Chevrolet P20 Van Engine: 5.7L V8 OHV; EngineVIN: Y; FuelSystem: 4BBL; with A/C;.