Part Type: HVAC Pressure Switch. 1973 Chevrolet Blazer Engine: 4.1L L6 OHV; EngineVIN: Q; FuelSystem: 1BBL; OE Number 01231581;. 1973 Chevrolet Blazer Engine: 4.8L L6 OHV; EngineVIN: T; FuelSystem: 1BBL; OE Number 01231581;.
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