Hose/Line HVAC: Description and Operation

Underbody Auxiliary A/C Lines
The underbody auxiliary A/C lines carry refrigerant to the auxiliary A/C evaporator inlet, and away from the auxiliary A/C evaporator outlet. The auxiliary underbody lines have the following characteristics:
- The auxiliary evaporator inlet line carries high-pressure refrigerant liquid from the TXV manifold and tube assembly to the auxiliary evaporator.
- The auxiliary evaporator outlet line carries refrigerant vapor from the auxiliary evaporator to the TXV manifold and tube assembly.

Underbody Heater Lines
The underbody auxiliary heater lines have the following features:
- The underbody auxiliary heater inlet line is a aluminum tube assembly that carries coolant from the engine coolant supply line to the auxiliary heater core inlet.
- The underbody auxiliary heater outlet line carries coolant from the auxiliary heater core to the front heater core outlet line.