GM Celebrity/Century/Ciera/6000 1982-1996 Repair Guide

High-Pressure Compressor Cut-Off Switch

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The function of the switch is to protect the engine from overheating in the event of excessively high compressor head pressure and to de-energize the compressor clutch before the high pressure relief valve discharge pressure is reached. The switch is mounted on the back of the compressor or on the refrigerant hose assembly near the back of the compressor. Servicing a switch mounted on the back of the compressor requires that the system be discharged. Switches mounted on the coupled hose assembly are mounted on Schrader-type valves and do not require discharging the system to be serviced.

REMOVAL & INSTALLATION



Compressor Mounted Switch

See Figure 1

Procedures for discharging and servicing the air conditioning system is described in Routine Maintenance . If a refrigerant recovery/recycling machine is not available, this job should be performed at a dealer or a shop that has the equipment.

  1. Disconnect the negative battery cable.
  2.  
  3. Properly discharge the air conditioning system into a recovery/recycling machine.
  4.  
  5. Remove the coupled hose assembly at the rear of the compressor.
  6.  
  7. Unplug the electrical connector.
  8.  
  9. Remove the switch retaining ring using internal snapring pliers.
  10.  
  11. Remove the switch from the compressor. Discard the O-ring.
  12.  



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Fig. Fig. 1: Compressor mounted switch - 3.3L (VIN N) shown

To install:
  1. Lubricate a new O-ring with refrigerant oil. Insert into the switch cavity.
  2.  
  3. Lubricate the control switch housing with clean refrigerant oil and insert the switch until it bottoms in the cavity.
  4.  
  5. Install the switch retaining snapring with the high point of the curved sides adjacent to the switch housing. Ensure that the retaining ring is properly seated in the switch cavity retaining groove.
  6.  
  7. Engage the electrical connector.
  8.  
  9. Lubricate new coupled hose assembly O-rings with refrigerant oil. Install on the hose assembly fittings.
  10.  
  11. Connect the coupled hose assembly to the compressor.
  12.  
  13. Connect the negative battery cable. Tighten the cable bolt to 11 ft. lbs. (15 Nm).
  14.  
  15. Evacuate, recharge and leak test the system.
  16.  
  17. Operate the system to ensure proper operation and leak test the switch.
  18.  
  19. Reset the radio, clock and any other applicable electronic devices.
  20.  

Refrigerant Line Mounted Switch
  1. Disconnect the negative battery cable.
  2.  
  3. Unplug the electrical connector.
  4.  
  5. Remove the switch from the coupled hose assembly. Discard the O-ring.
  6.  

To install:
  1. Lubricate a new O-ring with refrigerant oil.
  2.  
  3. Install the O-ring on the switch and install the switch.
  4.  
  5. Engage the electrical connector.
  6.  
  7. Connect the negative battery cable. Tighten the cable bolt to 11 ft. lbs. (15 Nm).
  8.  
  9. Reset the radio, clock and any other applicable electronic devices.
  10.  

 
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