RAM 1500 Van V8-5.9L VIN Z LDC (2001)
Hose/Line HVAC: Service and Repair
Underbody Refrigerant Line Replacement
REMOVAL
The underbody plumbing lines are used only on models with the optional rear heater-A/C unit. While the underbody suction line, liquid line, and
combination heater line are available for separate service replacement, all lines must be removed from the vehicle as a unit for service.
Any kinks or sharp bends in the underbody 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.
1. Disconnect and isolate the battery negative cable.
2. Recover the refrigerant from the refrigerant system.
3. Drain the engine cooling system.
4. From the engine compartment, disconnect the underbody liquid line at the liquid line extension and the underbody suction line at the suction line
jumper. Install plugs in, or tape over all of the opened refrigerant line fittings.
5. From the engine compartment, disconnect the heater supply and return hoses from the underbody combination heater line.
6. Remove the engine cover from the passenger compartment.
7. Raise and support the vehicle.
8. Disengage the front park brake release cable routing clip from the underbody suction line.
Fig. 11 Rear
9. From under the vehicle, disconnect the flare nut on the underbody liquid line from the threaded fitting on the rear heater-A/C unit liquid line.
Install plugs in, or tape over all of the opened refrigerant line fittings.
10. From under the vehicle, disconnect the flare nut on the underbody suction line from the threaded fitting on the rear heater-A/C unit suction line.
Install plugs in, or tape over all of the opened refrigerant line fittings.
11. From under the vehicle, disconnect the heater supply and return hoses from the rear heater-A/C unit heater lines.
