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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 800 (ENGINE COOLING SYSTEM)REPAIR INSTRUCTIONSDRAINING AND FILLING COOLING SYSTEMFILLING PROCEDURE
1999 GMC Forward Control 5.7 R, Automatic

Filling Procedure

1999 GMC Forward Control 5.7 R, AutomaticSECTION Filling Procedure
WARNING: This page is about a different car, the 2003 Buick Regal and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.

Tools Required 

J 23688  Coolant and Battery Fluid Tester. See Special Tools and Equipment .

NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
  1. Close the radiator drain cock.

    Tighten 

    Tighten the radiator drain cock to 2 N.m (18 lb in).

  2. If the engine block drain plug was removed, perform the following:
    1. 2.1. Apply pipe sealer to the drain plug.
    2. 2.2. Install the drain plug.

      Tighten 

      Tighten the drain plug to 22 N.m (16 lb ft).

  3. Lower the vehicle.
  4. Open the cooling system bleeder screws.
    IMPORTANT: Use a 50/50 mixture of DEX-COOL antifreeze and deionized water.
  5. Slowly fill the cooling system with a 50/50 coolant mixture.
  6. Close the cooling system bleeder screws.
  7. Install the coolant pressure cap.
  8. Start the engine.
  9. Run the engine at 2,000 - 2,500 RPM until the engine reaches normal operating temperature.
  10. Allow the engine to idle for 3 minutes.
  11. Shut the engine off.
  12. Allow the engine to cool.
  13. Top off the coolant as necessary.
  14. Inspect the concentration of the engine coolant. Using the J 23688  .
  15. Rinse away any excess coolant from the engine and the engine compartment.
  16. Inspect the cooling system for leaks.
RENDER: 1.0x

NO RELATED

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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.