🔧 Water Pump - Replacement

Your Sierra’s water pump circulates coolant through the engine and radiator. If it’s leaking, noisy, or not moving coolant well, replacing it now can prevent overheating and bigger engine damage.

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

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⚠️ Safety & Precautions

• Let the engine cool completely before opening the cooling system. Hot coolant can cause severe burns.
• Disconnect the negative battery cable before working near the mechanical fan and belt drive.
• Keep hands clear of the fan and pulleys at all times.
• Use jack stands if you raise the vehicle. Never rely on a jack alone.
• Dispose of old coolant properly. It is toxic to people and pets.
• Have a drain pan ready. This repair will spill coolant.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 13mm socket
• 15mm socket
• 18mm socket
• 36mm fan clutch wrench (specialty)
• Serpentine belt tool
• Ratchet
• Long extension
• Torque wrench
• Drain pan
• Funnel
• Plastic scraper
• Shop towels
• Gloves
• Safety glasses

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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 full system fill
• Water pump O-rings - Qty: 1 set
• Radiator drain plug seal - Qty: 1

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📋 Before You Begin

• Park on level ground and set the parking brake.
• Let the engine cool fully.
• Disconnect the negative battery cable.
• Raise the front only if you need extra access to the drain plug.
• Place a drain pan under the radiator.

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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 and drain the cooling system.
• Close the drain after flow stops.
• Tip: Crack the cap slowly only when fully cool.

Step 2: Remove the intake tube

• Use a 10mm socket to loosen the intake tube clamps and remove the tube.
• Move it out of the way for access to the belt and fan area.

Step 3: Remove the serpentine belt

• Use a serpentine belt tool to rotate the tensioner.
• Slip the belt off one pulley and remove it from the engine bay.
• Make sure you note the belt routing.

Step 4: Remove the fan and shroud

• Use a 36mm fan clutch wrench to loosen the fan clutch nut.
• Remove the fan and shroud assembly carefully.
• Lift it straight up to avoid damaging the radiator fins.
• Tip: A second set of hands helps here.

Step 5: Remove the water pump

• Use a 10mm socket and 13mm socket to remove the water pump bolts.
• Remove any coolant hoses attached to the pump.
• Pull the pump off the engine.
• Clean the mating surface with a plastic scraper and shop towels.

Step 6: Install the new water pump

• Install the new gasket on the pump.
• Position the new pump on the engine.
• Install all bolts finger-tight first.
• Use a torque wrench to tighten the water pump bolts in a crisscross pattern.
• Torque to 22 Nm (16 ft-lbs).

Step 7: Reinstall the fan, belt, and intake tube

• Reinstall the fan shroud and fan clutch assembly.
• Tighten the fan clutch nut with the 36mm fan clutch wrench.
• Reinstall the serpentine belt using the serpentine belt tool.
• Reinstall the intake tube and tighten the clamps with a 10mm socket.

Step 8: Refill and bleed the cooling system

• Use a funnel to refill with the correct engine coolant.
• Fill to the proper level.
• Start the engine and let it idle with the heater set to hot.
• Watch the coolant level and top off as air purges out.
• Check for leaks around the pump, hoses, and drain plug.

Step 9: Final check

• Let the engine reach operating temperature.
• Verify the heater blows warm air.
• Shut the engine off and recheck coolant level after it cools.

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✅ After Repair

• Inspect for leaks after a short test drive.
• Recheck coolant level the next day when cold.
• Watch the temperature gauge closely for the first few drives.

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💰 DIY vs Shop Cost

Shop Cost: $750-$1,250 (parts + labor)

DIY Cost: $180-$350 (parts only)

You Save: $570-$900 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?

HowToo makes it easy: same-day/2-day shipping on every part, plus all the tools and specialty tools you need! Check out the parts and tools sections below to add everything to your cart.