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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 362 (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 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, and 2002 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: When adding coolant, use DEX-COOL coolant. If silicated coolant is added to the system, premature engine, heater core or radiator corrosion may result. In addition, the engine coolant will require change sooner-at 50 000 km (30,000 mi) or 24 months.
  1. Inspect to make sure that the radiator drain cock is closed.
  2. Inspect to make sure that the block drain hole plug is tight.
  3. Add the DEX-COOL® to the radiator, then add clean drinkable water to the cooling system. If you use the old coolant, make sure the solution is clean and clear, and that the solution is a 50/50 mixture of glycol and water.
  4. Place a large top funnel in the radiator filler neck or surge tank.
  5. Slowly pour in the coolant. Because the thermostat is closed, filling the cooling system may be slow.
  6. Using the following procedures, bleed the air from the engine cooling system.
    1. Remove the cap from the surge tank.
    2. Remove the bleed screw (slotted) from the top of the thermostat housing.
    3. Pour coolant into the surge tank, and watch for coolant flowing from the bleed screw.
    4. When a constant flow of coolant is reached, closed the bleed screw at the top of the thermostat housing.
    5. Continue to fill the surge tank to the proper level.
    6. Install the cap on the surge tank.
  7. After filling the cooling system to 13 mm (0.5 in) below the radiator filler neck (4.3L, 5.0L, and 5.7L) or to the full mark on the surge tank (6.5L, 8.1L), start the engine and let the cooling system warm up. When the thermostat opens, the coolant level may drop. If the level drops, add coolant as necessary.
  8. Install the radiator or surge tank cap.
  9. Inspect the coolant level in the coolant recovery reservoir (4.3L, 5.0L, and 5.7L) or the surge tank (6.5L, 8.1L). Add coolant as necessary.
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.