🔧 Water Pump - Replacement

The water pump on your Sierra keeps coolant moving through the engine. If it is leaking, noisy, or wobbling, replacing it will restore cooling and help prevent overheating.

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

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⚠️ Safety & Precautions

• Let the engine cool completely before opening the cooling system.
• Coolant can spray out under pressure if the system is still hot.
• Disconnect the negative battery cable before working near the front of the engine.
• Keep hands, tools, and clothing clear of the belt drive and fan area.
• Use jack stands if you raise the front of the truck.
• Dispose of old coolant properly; it is toxic.

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🔧 Required Tools

You'll need the following tools for this repair:

• 3/8-inch drive ratchet
• 10mm socket
• 13mm socket
• 15mm socket
• 18mm socket
• Extensions
• Serpentine belt tool (specialty)
• Drain pan
• Gasket scraper
• Torque wrench
• Funnel
• Safety glasses
• Gloves
• 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 or seal - 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 fully.
• Disconnect the negative battery cable.
• If the truck is lifted, support it with jack stands.
• Have a drain pan ready before opening the cooling system.

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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 drain area and open the drain or lower hose connection.
• Drain enough coolant so the water pump area is mostly empty.
• Keep coolant off painted surfaces.

Step 2: Remove the intake duct and belt covers

• Use a 10mm socket to remove the intake duct or any covers blocking access.
• Set all clamps and fasteners aside in order.

Step 3: Remove the serpentine belt

• Use a serpentine belt tool or 15mm socket on the belt tensioner.
• Rotate the tensioner and slip the belt off the water pump pulley.
• Remove the belt from the front of the engine.

Step 4: Remove the water pump pulley

• Use a 10mm socket to remove the pulley bolts.
• Hold the pulley steady as you remove the last bolts.
• Remove the pulley and set it aside.

Step 5: Remove the water pump

• Use a 10mm socket and 13mm socket to remove the water pump bolts.
• Break the pump loose gently and pull it away from the engine.
• If it is stuck, tap it lightly with a rubber mallet.
• Do not pry on the aluminum sealing surface.

Step 6: Clean the mounting surface

• Use a gasket scraper to clean old gasket material from the engine.
• Wipe the surface clean and dry.
• Make sure no old gasket pieces fall into the engine.

Step 7: Install the new water pump

• Install the new gasket on the pump or engine, depending on the design.
• Position the water pump and start all bolts by hand.
• Tighten the bolts evenly in a crisscross pattern.
• Torque to 25 Nm (18 ft-lbs).

Step 8: Reinstall the pulley and belt

• Install the pulley and tighten the bolts with a 10mm socket.
• Torque to 25 Nm (18 ft-lbs).
• Reinstall the serpentine belt using the serpentine belt tool.
• Make sure the belt sits fully in every pulley groove.

Step 9: Reinstall removed parts

• Reinstall the intake duct and any covers with a 10mm socket.
• Reconnect the negative battery cable.

Step 10: Refill and bleed the cooling system

• Use a funnel to refill with the correct coolant mixture.
• Start the engine and let it warm up with the heater set to hot.
• Watch the coolant level and top off as air escapes.
• Check for leaks around the pump and hoses.

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✅ After Repair

• Verify the engine reaches normal operating temperature.
• Check for coolant leaks after the first drive.
• Recheck the coolant level after the engine cools again.
• Listen for belt noise and make sure the belt tracks correctly.

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💰 DIY vs Shop Cost

Shop Cost: $650-$1,050 (parts + labor)

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

You Save: $530-$790 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.