O-Ring/Flat Washer Description

Install new approved service replacement air conditioning O-ring(s) and flat washers whenever a joint or fitting is disassembled.
Some vehicles use flat sealing washers and O-ring(s) to seal the refrigerant system. The flat washers are used on block fittings of refrigerant components. The O-ring(s) is used to seal the refrigerant tubes. The O-ring fitting consists of:
^ An aluminum alloy, externally threaded fitting which is welded to an aluminum tube.
^ A free-spinning internally threaded nut.
^ An aluminum tube end which accommodates the O-ring(s).

Verify that the flat washers or O-ring(s) have not been damaged prior to installation. Replace damaged parts. Coat O-ring(s) and flat washers with the approved refrigerant oil.
Failure to use the proper service replacement parts and procedures may result in a leak.

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.