GM Buick/Oldsmobile/Pontiac/Full-Size 1975-1990 Repair Guide

Evaporator Core

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REMOVAL & INSTALLATION



See Figure 1

  1. Disconnect the negative battery cable.
  2.  
  3. Discharge the air conditioning system and recover the refrigerant as outlined in Routine Maintenance .
  4.  
  5. Disconnect the evaporator inlet and outlet pipe using a backup and a flare nut wrench. Seal the openings of the accumulator (large aluminum can) and evaporator to prevent moisture and contamination from entering the system.
  6.  
  7. Remove the air conditioner module upper case as outlined in this section.
  8.  
  9. Remove the evaporator clamp and evaporator by pulling the assembly straight up and out of the module lower case.
  10.  

To install:
  1. Add 3 fluid ounces (90 ml) of 525 refrigerant oil.
  2.  
  3. Install the evaporator and seals into the lower case. Make sure the seals and evaporator are properly positioned after the evaporator is in place.
  4.  
  5. Install the evaporator clamp.
  6.  
  7. Install the module upper case with a quality sealer.
  8.  
  9. Install new O-rings and torque the inlet and outlet fittings to the accumulator using a backup and flarenut wrench. Torque steel fittings to 32 ft. lbs. (44 Nm) and aluminum or copper fittings to 24 ft. lbs. (33 Nm).
  10.  
  11. Evacuate and recharge the air conditioning system as outlined in Routine Maintenance .
  12.  
  13. Connect the negative battery cable and test the system performance.
  14.  



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Fig. Fig. 1: Evaporator core location; all models similar

 
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