K 1500 Truck 4WD V8-5.7L VIN R (1997)
A/C Coupler O-ring: Service and Repair
O-Ring Seals
Coat air conditioning O-ring seals with 525 viscosity refrigerant oil just before installation. Slip them onto the flange tube to ensure proper locating
and sealing. To prevent the possibility of swelling and a reduction in sealing effectiveness, do not soak O-ring seals in refrigerant oil. Before
installation, O-ring seals and fittings should be examined to make sure they have not been nicked or deformed. Replace nicked or deformed parts to
prevent refrigerant leakage.