Jeep Wrangler/YJ 1987-1995 Repair Guide

Air Conditioning Compressor

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If your vehicle&rsquos A/C system uses R-12 refrigerant and is in need of recharging, the A/C system can be converted over to R-134a refrigerant (less environmentally harmful and expensive). Refer to General Information & Maintenance for additional information on R-12 to R-134a conversions, and for additional considerations dealing with your vehicle&rsquos A/C system.

ISOLATING THE COMPRESSOR



See Figure 1

It is not necessary to discharge the system for compressor removal. The compressor can be isolated from the rest of the system, eliminating the need for recharging.

  1. Connect a manifold gauge set.
  2.  



Click image to see an enlarged view

Fig. Fig. 1: Manual service valve positions

  1. Close both gauge hand valves and mid-position (crack) both compressor service valves.
  2.  
  3. Start the engine and turn on the air conditioning.
  4.  
  5. Turn the compressor suction valve slowly clockwise towards the front-seated position. When the suction pressure drops to zero, stop the engine and turn off the air conditioning. Quickly front-seat the valve completely.
  6.  
  7. Front-seat the discharge service valve.
  8.  
  9. Loosen the oil level check plug to remove any internal pressure.
  10.  

The compressor is now isolated and the service valves can now be removed.

REMOVAL & INSTALLATION



2.5L and 4.0L Engines

See Figure 2



Click image to see an enlarged view

Fig. Fig. 2: Compressor and mounting bracket-1991-95 vehicles

  1. Isolate the compressor, as previously described.
  2.  
  3. Disconnect the battery ground cable.
  4.  
  5. Remove the discharge and suction hoses from the compressor, then immediately cap all openings.
  6.  
  7. Loosen the alternator and remove the drive belt.
  8.  
  9. It may be necessary to remove the alternator from its brackets and set it out of the way.
  10.  
  11. Unbolt and remove the compressor.
  12.  
  13. For installation, install the compressor and alternator, connect the hoses, then install and tension the drive belt(s). Connect the compressor clutch wire. Open the valves.
  14.  

4.2L Engine

  1. Isolate the compressor, as previously described.
  2.  
  3. Disconnect the battery ground.
  4.  
  5. Remove the discharge and suction hoses from the compressor, then immediately cap all openings.
  6.  
  7. Loosen the alternator and remove the drive belts.
  8.  
  9. Remove the alternator from its brackets and set it out of the way.
  10.  
  11. Unbolt and remove the compressor.
  12.  
  13. For installation, install the compressor and alternator, connect the hoses, then install and tension the drive belt(s). Connect the compressor clutch wire. Open the valves.
  14.  

 
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