Part Type: HVAC Pressure Switch. 1973 GMC C25/C2500 Suburban Engine: 4.1L L6 OHV; FuelSystem: 1BBL; with System Mount Switch;. 1973 GMC C25/C2500 Suburban Engine: 4.8L L6 OHV; FuelSystem: 1BBL; with System Mount Switch;.
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