🔧 Water Pump - Replacement

The water pump moves coolant through your engine to keep it from overheating. On your Sierra, the pump is front-mounted and driven by the belt, so the job means relieving belt tension, removing the pump, and refilling the cooling system carefully.

Difficulty Level: Intermediate | Estimated Time: 2-4 hours

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⚠️ Safety & Precautions

• Work on a completely cool engine only. Hot coolant can cause severe burns.
• Use jack stands if you lift the truck. Never rely on a floor jack alone.
• Keep hands clear of the fan and belt path.
• Dispose of old coolant properly. It is toxic.
• No battery disconnect is required for this repair.

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🔧 Required Tools

You'll need the following tools for this repair:

• 3/8-inch drive ratchet
• 10mm socket
• 15mm socket
• 13mm socket
• Serpentine belt tool (specialty)
• Torque wrench
• Drain pan
• Gasket scraper
• Shop towels
• Funnel
• Jack stands
• Floor jack
• Safety glasses
• Gloves

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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: 2-3 gallons
• Thermostat gasket - Qty: 1

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📋 Before You Begin

• Park on level ground and set the parking brake.
• Let the engine cool completely before opening the cooling system.
• If the coolant level is above the pump, expect coolant to spill when the pump comes off.
• Tip: Take a photo of the belt routing first.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Drain the cooling system

• Place a drain pan under the radiator drain or lower hose area.
• Open the radiator drain or loosen the lower hose clamp with a flat-blade screwdriver if needed.
• Drain enough coolant to get the level below the water pump.
• Tip: Save old coolant only if it is clean.

Step 2: Remove the serpentine belt

• Use a serpentine belt tool to rotate the belt tensioner.
• Slip the belt off the alternator or another easy pulley.
• Slowly release the tensioner and remove the belt from the engine bay.

Step 3: Remove the fan shroud and fan clutch assembly

• Use a 10mm socket and 3/8-inch drive ratchet to remove the upper fan shroud fasteners.
• Lift the shroud upward and set it aside.
• If equipped, remove the fan clutch assembly using the correct fan clutch tool. Be careful not to damage the radiator.

Step 4: Remove the water pump pulley

• Use a 13mm socket to remove the pulley bolts.
• Hold the pulley steady by hand while loosening the bolts.
• Remove the pulley from the pump.

Step 5: Remove the water pump

• Use a 10mm socket to remove the water pump bolts.
• Note the different bolt lengths and keep them in order.
• Pull the pump straight off the engine.
• Catch any remaining coolant with the drain pan.

Step 6: Clean the sealing surface

• Use a gasket scraper and shop towels to clean the engine mating surface.
• Do not scratch the aluminum surface.
• Make sure the old gasket material is fully removed.

Step 7: Install the new water pump

• Install the new water pump gasket on the pump.
• Position the new pump on the engine by hand.
• Start all bolts by hand first.
• Use a 10mm socket and torque wrench to tighten the bolts evenly in a crisscross pattern.
• Torque to 15 Nm (11 ft-lbs).

Step 8: Reinstall the pulley, fan, shroud, and belt

• Reinstall the pulley and tighten the bolts with a 13mm socket.
• Torque to 25 Nm (18 ft-lbs).
• Reinstall the fan clutch assembly if removed.
• Reinstall the fan shroud and secure it with the 10mm socket.
• Route the serpentine belt using the belt routing diagram and reinstall it with the serpentine belt tool.

Step 9: Refill the cooling system

• Close the drain and refill with the correct engine coolant through a funnel.
• Fill slowly to help reduce trapped air.
• Install the radiator cap only after initial bleeding is complete.

Step 10: Bleed the air and check for leaks

• Start the engine and let it idle with the heater set to hot.
• Watch the coolant level and top off as needed.
• Inspect the water pump, hose connections, and drain area for leaks.
• Bring the engine up to operating temperature and confirm the heater blows warm air.

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✅ After Repair

• Recheck coolant level after the engine cools completely.
• Look for any seepage around the pump after a short road test.
• Monitor the temperature gauge for the next few drives.
• If the engine still runs hot, air may still be trapped in the system.

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💰 DIY vs Shop Cost

Shop Cost: $450-$850 (parts + labor)

DIY Cost: $120-$260 (parts only)

You Save: $330-$590 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 2-4 hours.

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🎯 Ready to get started?

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