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LOW OR DIFFERENTIAL PRESSURE CUT-OFF SWITCH

REMOVAL AND INSTALLATION

WARNING: THE REFRIGERATION SYSTEM MUST BE COMPLETELY DISCHARGED BEFORE PROCEEDING WITH THIS OPERATION. REFER TO DISCHARGING REFRIGERATION SYSTEM IN THE REFRIGERANT SERVICE PROCEDURES SECTION.

(1)Disconnect the boot like wire connector at the cut-off switch.

(2)Using a sender unit type socket, remove the switch from the expansion valve (Fig. 18 or 19).

Fig. 18 Low Pressure Cut-Off Switch and Expansion

ValveÐTypical

Fig. 19 Differential Pressure Cut-Off Switch and

Expansion ValveÐTypical

To install, assure an adequate seal by using a small amount of thread sealing tape on the replacement switch and reverse the preceding steps.

Evacuate and charge the system.

HEATING AND AIR CONDITIONING 24 - 51

EXPANSION VALVE

REMOVAL

WARNING: THE REFRIGERATION SYSTEM MUST BE COMPLETELY DISCHARGED BEFORE PROCEEDING WITH THIS OPERATION. REFER TO DISCHARGING REFRIGERATION SYSTEM IN THE REFRIGERANT SERVICE PROCEDURES SECTION.

(1)Remove the boot-type wire connector from the pressure cut-off switch.

(2)Remove the attaching bolt in center of refrigerant line-plumbing sealing plate (Fig. 20).

Fig. 20 Expansion Valve

(3)Carefully pull the refrigerant line-sealing plate assembly from the expansion valve towards front of vehicle. Do Not scratch the expansion valve sealing surfaces with pilot tubes.

(4)Cover the openings on A/C line-sealing plate assembly to prevent contamination.

(5)Remove two screws securing the expansion valve to the evaporator sealing plate.

(6)Carefully remove valve.

INSTALLATION

(1)Remove and replace the aluminum gasket on the evaporator sealing plate.

(2)Carefully hold the expansion valve to the evaporator sealing plate (do not scratch sealing surface).

Install two attaching screws and tighten to 11 6 3 NIm (100 6 30 inch lbs.).

(3)Remove and replace the aluminum gasket (Fig.

15)on the refrigerant line-sealing plate assembly.

(4)Carefully hold the refrigerant line-sealing plate

assembly to the expansion valve, install bolt and tighten to 23 6 3 NIm (200 6 30 inch lbs.).

(5)Connect wires to low pressure cut-off switch.

(6)Evacuate and recharge system.