GM Service Manual Online
For 1990-2009 cars only

Initial Setup

Refer to the manufacturer's instructions for all initial setup procedures.

Operational Setup


Object Number: 277008  Size: SH

       Caution: Always wear goggles and gloves when doing work that involves opening the refrigerant system. If liquid refrigerant comes into contact with the skin or eyes, injury may result.

       Caution: Use only authorized 23-kg (50-lb.) refillable tanks (J 39500-50). Use of other tanks could cause personal injury and void the warranty.

       Notice: Refrigerant-134a systems have special fittings (per SAE specifications) to avoid cross-contamination with Refrigerant-12 systems. Do not attempt to adapt this unit to Refrigerant-12 systems as severe system failure will result.

    • Connect the following hoses to the ACR4 unit:
      • The high side (Red) hose
      • The low side (Blue) hose
    • Route the hoses through the hose reel bracket grommets.