GM Chevy Mid-Size Cars 1964-1988 Repair Guide

Evaporator Core

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REMOVAL & INSTALLATION




CAUTION
Please refer to Routine Maintenance before discharging the compressor or disconnecting air conditioning lines. Damage to the air conditioning system or personal injury could result. Consult your local laws concerning refrigerant discharge and recycling. In many areas it may be illegal for anyone but a certified technician to service the A/C system. Always use an approved recovery station when discharging the air conditioning.

1964-70
  1. Properly discharge and recover the refrigerant in the A/C system using a suitable recovery station.
  2.  
  3. Remove the right fender skirt and hood hinge.
  4.  
  5. Disconnect the high pressure line at the condenser and the suction throttling valve to the compressor line at the suction throttling valve. Cover all lines immediately to prevent system contamination and subsequent damage.
  6.  
  7. Take out the three screws attaching the duct assembly to the evaporator housing and the blower assembly.
  8.  
  9. Take out the nine bolts holding the evaporator assembly to the cowl and lift out the assembly.
  10.  
  11. The core can be removed by removing the screws attaching the core to the case and lifting the core from the case.
  12.  
  13. After installing the evaporator core and tightening the refrigerant lines, evacuate, leak test and charge the system.
  14.  

1971-73

Core removal and installation may be made without removing the entire evaporator assembly.

  1. Properly discharge and recover the refrigerant in the A/C system using a suitable recovery station.
  2.  
  3. Disconnect the negative battery cable, then remove the carburetor air cleaner assembly.
  4.  
  5. Remove the expansion valve bulb from the core outlet line and the core outlet line at the POA valve. Disconnect the core outlet line at the expansion valve.
  6.  
  7. Remove the clamp screw and move the expansion valve and line out of the way.
  8.  
  9. Disconnect all wires and hoses attached the the evaporator assembly.
  10.  
  11. Remove the nuts and screws from the evaporator cover, and carefully pull the cover upward and outward.
  12.  
  13. Remove the core retaining screws and remove the core.
  14.  

To install:
  1. Install the core and tighten the retaining screws.
  2.  
  3. Install the cover, then secure using the nuts and screws.
  4.  
  5. Connect all wires and hoses to the evaporator assembly.
  6.  
  7. Reposition the expansion valve and line, then tighten the clamp screw.
  8.  
  9. Connect the core outlet line to the expansion valve, then install the expansion valve bulb to the core outlet line and the the core outlet line to the P