Hose/Line HVAC: Description and Operation

UNDERBODY LINES - REAR
The rear heater-A/C unit plumbing is used only on models with the optional rear heater-A/C unit. The formed metal rear heater-A/C unit suction line, liquid line, and heater lines are available for separate service replacement. The molded and straight heater hoses used on the rear heater-A/C unit can be serviced in the vehicle.

Fig.9 Rear Heater And A/C Lines:

Fig.10 Front Lines Connected To Rear Lines:

Fig.12 Rear Heater Hose Quick Connects:

Fig.11 Rear Heater Hose Connection:

Fig.13 Rear A/C Block Connection:

The rear heater and A/C lines are all serviced as individual pieces. When disconnecting any line or block ensure that the area around it is clean of any contaminations that can get in to the system,,, and.

Any kinks or sharp bends in the rear heater-A/C unit plumbing will reduce the capacity of the entire heating and air conditioning system. Kinks and sharp bends reduce the system flow. High pressures are produced in the refrigerant system when the air conditioning compressor is operating. High temperature coolant is present in the heater plumbing when the engine is operating. Extreme care must be exercised to make sure that each of the plumbing connections is pressure-tight and leak free.