Commander 4WD V6-3.7L VIN K (2007)
Hose/Line HVAC: Description and Operation
Plumbing-Front
Description
DESCRIPTION
The A/C refrigerant lines and hoses are used to carry the refrigerant between the various A/C system components. The refrigerant lines and hoses for the
R-134a A/C system consist of a barrier-hose design with a nylon tube sandwiched between rubber layers. The nylon tube helps to contain the R-134a
refrigerant, which has a small molecular structure. The ends of the refrigerant lines are made from lightweight aluminum and braze-less fittings.
Any kinks or sharp bends in the refrigerant lines and hoses will reduce the capacity of the entire A/C system and can reduce the flow of refrigerant within
the system.
Operation
OPERATION
High pressures are produced in the refrigerant system when the A/C compressor is operating. Extreme care must be exercised to make sure that each of
the refrigerant system connections is pressure-tight and leak free. It is a good practice to inspect all flexible hose refrigerant lines at least once a year to
make sure they are in good condition and properly routed.
The refrigerant lines and hoses are coupled to other A/C system components with block-type fittings. A flat steel gasket with an integral O-ring (dual
plane seal) is used to mate the refrigerant line fittings with A/C system components to ensure the integrity of the refrigerant system.
The refrigerant lines and hoses cannot be repaired and must be replaced if found to be leaking or damaged.
Line-A/C Discharge
DESCRIPTION
NOTE: LHD model with 4.7L engine shown in illustration. RHD model and other engines similar.
The A/C discharge line (1) is the refrigerant line that carries refrigerant from the A/C compressor (2) to the A/C condenser (3). The A/C discharge line
on models equipped with the 5.7L engine include a fitting for the A/C pressure transducer.
NOTE: Replacement of the refrigerant line O-ring seals and gaskets is required anytime a refrigerant line is opened. Failure to replace the rubber O-ring
seals and metal gaskets could result in a refrigerant system leak.
The A/C discharge line has no serviceable parts except for the dual plane seals. The seals used on the connections are made from a special type of rubber
not affected by R-134a refrigerant. The seals must be replaced whenever the A/C discharge line is removed and installed.
The A/C discharge line cannot be repaired and must be replaced if found to be leaking or damaged.
Line-A/C Liquid
DESCRIPTION
