Durango 2WD V8-5.7L (2008)
Hose/Line HVAC: Description and Operation
Underbody Line
DESCRIPTION
Models equipped with the rear heating-A/C system use metal lines (1) attached to the vehicle underbody (2) to carry refrigerant and engine coolant
to/and from the rear A/C evaporator and heater core. The underbody A/C lines are connected to the front A/C suction and liquid lines by spring-lock type
couplers and secondary retaining clips See: Coupler HVAC/Description and Operation/Description and to the rear HVAC housing (3) by a tapping plate
(4) and nut (5). The metal underbody heater lines have rubber hose ends that are connected to the front heater hoses and the rear HVAC housing by use
of spring-clamp type heater hose clamps. The underbody lines are retained by plastic mounting brackets (6) and screws (7) and can be repaired
(depending on the amount of damage) by using A/C Line Repair Tool Kit 8456-A or equivalent See: Service and Repair/Procedures.
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 underbody lines can only be removed by lifting the body off of the frame and have no serviceable parts except for the refrigerant line rubber O-ring
seals and the mounting brackets. The O-ring seals used on the refrigerant line connections are made from a special type of rubber not affected by R-134a
refrigerant. The O-ring seals must be replaced whenever the underbody refrigerant lines are disconnected.
