Jeep Cherokee (XJ): Suction and discharge line. Vacuum check valve. Vacuum reservoir

Jeep Cherokee (XJ) 1984 - 2001 Service Manual > Heating and air conditioning > Removal and installation > Suction and discharge line. Vacuum check valve. Vacuum reservoir

Suction and discharge line

Any kinks or sharp bends in the refrigerant plumbing will reduce the capacity of the entire air conditioning system. Kinks and sharp bends reduce the flow of refrigerant in the system. A good rule for the flexible hose refrigerant lines is to keep the radius of all bends at least ten times the diameter of the hose. In addition, the flexible hose refrigerant lines should be routed so they are at least 80 millimeters (3 inches) from the exhaust manifold.

High pressures are produced in the refrigerant system when the air conditioning 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.

WARNING: REVIEW THE WARNINGS AND CAUTIONS IN THE FRONT OF THIS GROUP BEFORE PERFORMING THE FOLLOWING OPERATION.

REMOVAL

(1) Disconnect and isolate the battery negative cable.

(2) Recover the refrigerant from the refrigerant system. See Refrigerant Recovery in this group for the procedures.

(3) Unplug the wire harness connector from the high pressure cut-off switch.

(4) Disconnect the discharge line refrigerant line fitting from the condenser inlet tube (Fig. 56). See Refrigerant Line Coupler in this group for the procedures.

Install plugs in, or tape over all of the opened refrigerant line fittings.

(5) Remove the nut that secures the suction line block fitting to the accumulator outlet. Install plugs in, or tape over all of the opened refrigerant line fittings.

(6) Remove the screw that secures the suction and discharge line manifold to the compressor. Install plugs in, or tape over all of the opened refrigerant line fittings.

(7) Remove the suction and discharge line assembly from the vehicle.

INSTALLATION

(1) Remove the tape or plugs from the suction and discharge line manifold and the compressor. Install the suction and discharge line manifold to the compressor.

Tighten the mounting screw to 28 N·m (250 in. lbs.).

(2) Remove the tape or plugs from the suction line and the accumulator outlet block fittings. Install the suction line to the accumulator outlet and tighten the mounting nut to 9 N·m (80 in. lbs.).

(3) Remove the tape or plugs from the refrigerant line fittings on the discharge line and the condenser inlet tube. Connect the discharge line refrigerant line coupler to the condenser inlet tube. See Refrigerant Line Coupler in this group for the procedures.

Fig. 56 Suction and Discharge Line
Fig. 56 Suction and Discharge Line

1 - SUCTION AND DISCHARGE LINE
2 - SCREW
3 - COMPRESSOR
4 - CONDENSER
5 - INLET
6 - CLIP
7 - HEX NUT
8 - ACCUMULATOR

(4) Plug in the wire harness connector to the high pressure cut-off switch.

(5) Connect the battery negative cable.

(6) Evacuate the refrigerant system. See Refrigerant System Evacuate in this group for the procedures.

(7) Charge the refrigerant system. See Refrigerant System Charge in this group for the procedures.

Vacuum check valve

(1) Unplug the heater-A/C vacuum supply line connector at the vacuum check valve (Fig. 57).

(2) Note the orientation of the check valve in the vacuum supply line for correct reinstallation.

(3) Unplug the vacuum check valve from the vacuum supply line fittings.

(4) Reverse the removal procedures to install.

Fig. 57 Vacuum Supply
Fig. 57 Vacuum Supply

1 - VACUUM CHECK VALVE
2 - TO ENGINE INTAKE MANIFOLD
3 - TO HEATER-A/C CONTROLS
4 - TO VACUUM RESERVOIR
5 - TO SPEED CONTROL SERVO
6 - VACUUM SUPPLY LINE

Vacuum reservoir

(1) Remove the passenger side bumper end cap from the front bumper. Refer to Group 23 - Body for the procedures.

(2) Unplug the vacuum supply line connector from the vacuum reservoir (Fig. 58).

Fig. 58 Vacuum Reservoir Remove/Install
Fig. 58 Vacuum Reservoir Remove/Install

1 - VACUUM LINE
2 - RESERVOIR SCREWS
3 - VACUUM RESERVOIR

(3) Remove the two screws that secure the vacuum reservoir to the front bumper.

(4) Remove the vacuum reservoir from behind the front bumper.

(5) Reverse the removal procedures to install.

Tighten the mounting screws to 2.2 N·m (20 in. lbs.).

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