Durango 4WD V8-5.9L VIN Z (1998)
Coupler HVAC: Description and Operation
Refrigerant Line Coupler
Spring-lock type refrigerant line couplers are used to connect many of the refrigerant lines and other components to the refrigerant system. These
couplers require a special tool for disengaging the two coupler halves.
Spring-Lock Coupler - Typical
The spring-lock coupler is held together by a garter spring inside a circular cage on the male half of the fitting. When the two coupler halves are
connected, the flared end of the female fitting slips behind the garter spring inside the cage on the male fitting. The garter spring and cage prevent
the flared end of the female fitting from pulling out of the cage.
Two O-rings on the male half of the fitting are used to seal the connection. These O-rings are compatible with R-134a refrigerant and must be
replaced with 0-rings made of the same material.
Secondary clips are installed over the two connected coupler halves at the factory for added blow-off protection. In addition, some models have a
plastic ring that is used at the factory as a visual indicator to confirm that these couplers are connected. After the coupler is connected, the plastic
indicator ring is no longer needed; however, it will remain on the refrigerant line near the coupler cage.
