Assumption: This procedure is for your Sierra with the 6.2L V8 and factory-style belt-driven water pump.

🔧 Water Pump - Replacement

The water pump circulates coolant through the engine and radiator. If it is leaking, noisy, or the bearing is failing, replacement is the correct fix to prevent overheating and engine damage.

Difficulty Level: Intermediate | Estimated Time: 3-5 hours

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⚠️ Safety & Precautions

• Work only on a completely cool engine. Hot coolant can cause severe burns.
• Keep hands, clothing, and tools away from the fan and belt path.
• Use a drain pan and dispose of used coolant properly.
• Disconnect the negative battery cable before starting.
• On 4WD trucks, work with enough clearance to reach the lower pulley area safely.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 13mm socket
• 15mm socket
• 18mm socket
• 3/8-inch ratchet
• 1/2-inch breaker bar
• Torque wrench
• Serpentine belt tool (specialty)
• Drain pan
• Funnel
• Pick tool
• Gasket scraper
• Safety glasses
• Nitrile gloves
• Jack and jack stands

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Water pump - Qty: 1
• Water pump gasket - Qty: 1
• Engine coolant - Qty: 1-2 gallons
• Thermostat gasket - Qty: 1
• Water pump bolts - Qty: 1 set

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📋 Before You Begin

• Park on level ground and set the parking brake.
• Let the engine cool fully before opening the cooling system.
• Disconnect the negative battery cable with a 10mm socket.
• Raise the front of the truck if you need more access to the lower front engine area.
• Place a drain pan under the radiator drain or lower hose.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Drain the coolant

• Use a drain pan under the radiator.
• Open the radiator drain or remove the lower radiator hose clamp and drain enough coolant to get the level below the water pump.
• Keep coolant off belts.

Step 2: Remove the engine cover and intake ducting

• Use a 10mm socket to remove any engine cover fasteners if equipped.
• Remove the intake ducting if it blocks access to the fan shroud or belt area.

Step 3: Remove the serpentine belt

• Use the serpentine belt tool on the tensioner to relieve belt tension.
• Slip the belt off the water pump pulley and carefully release the tensioner.
• Inspect the belt for cracks or glazing before reuse.

Step 4: Remove the fan assembly and shroud

• Use a 15mm socket and wrench to remove the fan clutch fasteners if equipped with a mechanical fan setup.
• Lift the fan and shroud out carefully. This may take some maneuvering.
• Watch the radiator fins.

Step 5: Remove the water pump pulley

• Use an 18mm socket to remove the pulley bolts while holding the pulley steady.
• Remove the pulley from the water pump.

Step 6: Remove the water pump

• Use a 10mm socket to remove the water pump bolts in a crisscross pattern.
• Remove the pump from the engine block.
• If it sticks, tap gently with a soft mallet. Do not pry against sealing surfaces.
• Clean the mating surface with a gasket scraper until it is smooth and dry.

Step 7: Install the new water pump

• Install the new gasket on the pump. Use a small amount of coolant-safe sealant only if the gasket manufacturer specifies it.
• Set the pump in place and start all bolts by hand.
• Use a 10mm socket to tighten the bolts evenly in a crisscross pattern.
• Torque to 25 Nm (18 ft-lbs).

Step 8: Reinstall the pulley, fan, and belt

• Install the water pump pulley and start the bolts by hand.
• Use an 18mm socket to tighten the pulley bolts.
• Torque to 25 Nm (18 ft-lbs).
• Reinstall the fan and shroud, then reinstall the serpentine belt using the belt tool.
• Make sure the belt is seated in every pulley groove.

Step 9: Refill and bleed the cooling system

• Use a funnel to refill with the correct coolant mix.
• Bleed air from the system per the truck’s cooling system fill procedure.
• Install the radiator cap only after the level stabilizes and air is purged.
• Torque to 2 Nm (18 in-lbs) if your bleed screw uses a small cap or screw fastener.

Step 10: Check for leaks and verify operation

• Reconnect the battery cable with a 10mm socket.
• Start the engine and let it idle.
• Watch for leaks at the pump, hose connections, and drain point.
• Check that coolant begins circulating as the engine warms up.

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✅ After Repair

• Top off coolant again after the first heat cycle.
• Recheck for leaks after a short test drive.
• Watch the temperature gauge for normal operation.
• If the old pump failed from bearing noise or contamination, inspect the belt and tensioner closely.

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💰 DIY vs Shop Cost

Shop Cost: $650-$1,100 (parts + labor)

DIY Cost: $120-$280 (parts only)

You Save: $530-$820 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 3-5 hours.

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🎯 Ready to get started?

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