Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 492 (ENGINE COOLING SYSTEM)REPAIR INSTRUCTIONSWATER PUMP REPLACEMENT (4.3L)REMOVAL PROCEDURE

1999 GMC Forward Control 5.7 R, Automatic

Removal Procedure

1999 GMC Forward Control 5.7 R, AutomaticSECTION Removal Procedure

WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.

Drain the cooling system. Refer to DRAINING AND FILLING COOLING SYSTEM .
Loosen the water pump pulley bolts.
Remove the cooling fan and clutch assembly.
Refer to FAN CLUTCH REPLACEMENT .
Remove the drive belt. Refer to DRIVE BELT REPLACEMENT in Engine Mechanical - 4.3L.
Remove the water pump pulley mounting bolts.
Remove the water pump pulley.

Fig 1: Removing Water Pump Pulley
Courtesy of GENERAL MOTORS CORP.
Remove the radiator outlet hose clamp from the water pump.
Remove radiator outlet hose from the water pump.

Fig 2: Removing Radiator Outlet Hose From Water Pump
Courtesy of GENERAL MOTORS CORP.
Remove the water pump mounting bolts.

Fig 3: Removing Water Pump Mounting
Courtesy of GENERAL MOTORS CORP.
Remove the water pump from the engine.

Fig 4: Removing Water Pump From Engine
Courtesy of GENERAL MOTORS CORP.
Remove the water pump gaskets.
Clean the water pump gasket mating surfaces.

Fig 5: Removing Water Pump Gaskets
Courtesy of GENERAL MOTORS CORP.

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.