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Home >> GMC >> 1993 >> Forward Control 7.4 N >> Repair and Diagnosis (Single Page) >> Heating, Ventilation & A/C (HVAC) >> A/C System General Servicing >> USING R-12 & R-134a REFRIGERANT >> IDENTIFYING R-134a SYSTEMS & COMPONENTS >> Fittings & "O" Rings

Fittings & "O" Rings

All R-134a based A/C systems use 1/2" - 16 ACME threaded fittings (identifiable by square threads) and quick-connect service couplings.

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