K 1500 Truck 4WD V8-4.8L VIN V (1999)
A/C Coupler O-ring: Description and Operation
Service Caps Seal
The primary seal for the service ports is the sealing cap. The cap contains a specially designed O-ring or gasket which provides a leak free seal. Should
the cap be loose, missing, or the wrong usage, a loss of refrigerant could result.
