SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 20 (HVAC SYSTEM - GENERAL SERVICING)REFRIGERANT RECOVERY/RECYCLINGGENERAL MOTORS
1999 GMC Forward Control 5.7 R, Automatic

General Motors

1999 GMC Forward Control 5.7 R, AutomaticSECTION General Motors
WARNING: This page does not describe the selected car, but rather 71 other vehicles, including the 1996 Saturn SW2, 1996 Saturn SW1, 1996 Saturn SL2, 1996 Saturn SL1, and 1996 Saturn SL. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ensure A/C Refrigerant Recovery, Recycling And Recharging (ACR4) System (J-39500) is not plugged into wall socket. Close both valves on manifold gauge set. Connect manifold gauge set to high-side (Red hose) and low-side (Blue hose) to the A/C system fitting using quick disconnect couplers. Refer to SERVICE VALVE LOCATIONS under SYSTEM SERVICE VALVES  . Open coupler valves and check high-side and low-side gauges. If there is no pressure in the system, the system is empty.
    NOTE: If A/C system is empty, do not continue recovery operation. Air will be drawn into recovery tank and contaminate recovered refrigerant.
  2. Open both high-side and low-side valves on control panel of ACR4 system. Open both Red gas (vapor) and Blue liquid valve on recovery tank. Slowly open oil drain valve and allow any oil in oil separator to drain into catch bottle. Empty catch bottle.
  3. Plug ACR4 into wall socket and turn MAIN POWER switch to ON position. Start engine. Turn A/C on for about 2 minutes to stabilize system. Turn ignition off. Connect a battery charger to vehicle battery. Turn ignition to RUN position. Turn blower motor to HIGH, which will increase refrigerant recovery rate.
  4. Press RECOVER button on ACR4 keypad to begin refrigerant recovery. Before recovery begins ACR4 will clear itself of refrigerant. CL-L will be displayed and after 30-180 seconds, recovery will begin. Keep blower motor in HIGH until automatic recovery process is complete.
  5. When ACR4 clearing is complete, recovery will begin. RECOVER mode of AUTOMATIC cycle will be indicated along with weight of refrigerant recovered. ACR4 compressor will shut off when initial recovery has occurred, at approximately 17 in. Hg. vacuum. When initial recovery process is completed, CPL and then OIL/OZ (OIL/GMS) will be alternately displayed.
    NOTE: OIL/OZ (OIL/GMS) will be displayed as a reminder to check oil separator catch bottle for oil removed from system. It is important to replace any oil removed with the same amount of NEW oil.
  6. Wait 5 minutes. Check ACR4 control panel low side gauge. If A/C system has maintained a vacuum, recovery is complete. If low side gauge pressure is greater than zero, system contains more refrigerant. If low side pressure is greater than zero, press HOLD/CONT button on control panel to recover additional refrigerant. Repeat this procedure until system maintains vacuum for at least 2 minutes.
NOTE: If FULL is displayed during recovery process, and ACR4 shuts off, the tank is full. Replace tank with an empty one or lower amount of refrigerant in tank by charging another vehicle.
RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready ToolsFree Quote CheckQuote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.