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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 718 (HEATING, VENTILATION & AIR CONDITIONING)REPAIR INSTRUCTIONSCONDENSER REPLACEMENTINSTALLATION PROCEDURE
1999 GMC Forward Control 5.7 R, Automatic

Installation Procedure

1999 GMC Forward Control 5.7 R, AutomaticSECTION Installation Procedure
WARNING: This page is about a different car, the 2002 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
  1. Install the upper rubber mounts on to the condenser.
  2. Install the lower ends of the condenser in to the lower rubber mounts.

    Important:  Ensure the upper rubber mounts stay in place on the condenser.

  3. Tilt the top of the condenser in to place.

    Important:  Coat the new O-ring seals with mineral base 525 viscosity refrigerant oil.

  4. Install the new O-ring seals onto the A/C compressor hose and the condenser tube. Refer to O-Ring Replacement .
    Fig 1: Condenser Upper Rubber Mounts
    G01672657Courtesy of GENERAL MOTORS CORP.
  5. Connect the condenser tube to the condenser.
    NOTE: Refer to FASTENER NOTICE .
  6. Tighten the condenser tube nut.

    Tighten 

    Tighten the nut to 27 N.m (20 lb ft).

    Fig 2: Condenser Tube & Nut
    G01672658Courtesy of GENERAL MOTORS CORP.
  7. Connect the A/C compressor hose to the condenser.
  8. Install the A/C compressor hose block fitting nut to the condenser.

    Tighten 

    Tighten the nut to 16 N.m (12 lb ft).

  9. Install the radiator. Refer to RADIATOR REPLACEMENT .
  10. Install the front fender upper diagonal. Refer to BRACE REPLACEMENT -- SHEET METAL DIAGONAL .
  11. Install the air cleaner assembly. Refer to AIR CLEANER ASSEMBLY .
    Fig 3: A/C Compressor Hose & Fitting Nut
    G01672659Courtesy of GENERAL MOTORS CORP.
  12. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .
  13. Leak test the fittings of the component using J 39400-A  .
RENDER: 1.0x

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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.