Spring Lock Coupling

The spring lock coupling is part of another assembly and is not available as a separate item. F-Series vehicles use tube O-fittings except for the evaporator liquid line, which is a spring lock coupling.

The spring lock coupling is a refrigerant line coupling held together by a garter spring inside a circular cage. When the spring lock coupling is connected, the flared end of the female fitting slips behind the garter spring inside the cage of the male fitting. The garter spring and cage then prevent the flared end of the female fitting from pulling out of the cage.

Two O-rings are used to seal between the two components of the spring lock coupling. These O-rings are green and made of special material. They must be replaced with an O-ring made of the same material. Use only the O-rings listed in the Master Parts Catalog for the spring lock coupling.

A plastic indicator ring is used on the spring lock coupling to indicate, during vehicle assembly, that the spring lock coupling is connected. Once the spring lock coupling is connected, the indicator ring is no longer necessary but will remain captive by the spring lock coupling near the cage opening.

After the spring lock coupling has been cleaned, install new O-rings lubricated with clean refrigerant oil. Connect the spring lock coupling by pushing with a slight twisting motion. When the spring lock coupling is connected a distinct click or snap should be heard or felt, indicating positive engagement. If possible, visually inspect the cage to make sure that the flared end of the female fitting is fully behind the garter spring. Otherwise, push and pull on the fitting to verify engagement.