🔧 Charger - Water Pump Replacement

The water pump circulates coolant through your A4—wait—your Charger’s engine and radiator to keep temperatures under control. If the pump is leaking (coolant drip at the pump/weep hole) or the bearing is failing (whine/wobble), replacement is the correct fix.

Difficulty Level: Intermediate | Estimated Time: 2.5-4.0 hours

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⚠️ Safety & Precautions

• ⚠️ Never open the coolant system hot; let it cool fully first.
• ⚠️ Coolant is toxic—use a drain pan and keep pets away.
• ⚠️ Keep fingers/tools clear of the cooling fan; it can turn on unexpectedly.
• ⚠️ Battery disconnect is recommended before working near the fan wiring.
• ⚠️ Support the Charger with jack stands if you raise the front.

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🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Nitrile gloves
• Floor jack (rated 3-ton minimum)
• Jack stands (rated 3-ton minimum)
• Wheel chocks
• Drain pan (at least 3-gallon)
• Funnel
• Spill-free coolant funnel kit (specialty)
• 3/8" drive ratchet
• 3/8" drive extension set
• 10mm socket
• 13mm socket
• 15mm socket
• Serpentine belt tool 15mm (specialty)
• Torque wrench (10-100 ft-lbs range)
• Hose clamp pliers (specialty)
• Trim clip removal tool
• Plastic scraper
• Shop towels
• Brake cleaner spray

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Water pump - Qty: 1
• Water pump gasket / seal - Qty: 1
• Engine coolant (OAT, 50/50 premix) - Qty: 2-3 gallons
• Serpentine belt - Qty: 1 (Recommended while you’re here)

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📋 Before You Begin

• Park on level ground, set the parking brake, and chock the rear wheels.
• Let the engine cool completely (upper radiator hose should feel cool).
• Disconnect the negative battery cable using a 10mm socket.
• If you raise the front, lift with a floor jack and support with jack stands.
• Place a drain pan under the radiator drain area before opening anything.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Drain the coolant

• Place the drain pan under the radiator drain area.
• Open the radiator drain and let coolant flow into the pan. Use shop towels to control splashes.
• Open the coolant reservoir cap slowly after the system is cool to help it drain faster.

Step 2: Remove the upper intake duct (for access)

• Loosen the intake clamps using a 10mm socket.
• Release any clips with a trim clip removal tool, then lift the duct out.

Step 3: Remove the cooling fan / shroud assembly (as equipped)

• Unplug the fan electrical connector(s) by hand (press the lock tab).
• Remove the fan/shroud fasteners using a 10mm socket and 3/8" drive ratchet.
• Lift the assembly straight up and out carefully.
• Tip: Tilt slightly to clear the radiator hoses.

Step 4: Remove the serpentine belt

• Put a 15mm socket on the belt tensioner bolt.
• Rotate the tensioner to relieve belt tension, then slip the belt off one pulley.
• Slowly release the tensioner and remove the belt.
• Tip: Take a quick photo of belt routing.

Step 5: Disconnect hoses at the water pump

• Use hose clamp pliers to compress the spring clamp(s), then slide them back on the hose.
• Twist the hose gently to break it loose, then pull it off the pump.
• Catch remaining coolant with the drain pan.

Step 6: Remove the water pump

• Remove the water pump mounting bolts using a 13mm socket, 3/8" drive ratchet, and extensions as needed.
• Pull the water pump straight off the timing cover.
• Remove and discard the old water pump gasket / seal.

Step 7: Clean the sealing surface

• Use a plastic scraper to remove old gasket material from the timing cover.
• Wipe clean with shop towels and brake cleaner spray until dry and smooth.
• Do not gouge the aluminum surface.

Step 8: Install the new water pump

• Install the new water pump gasket / seal onto the new pump (or onto the engine side, depending on your gasket design).
• Position the new pump and hand-start all bolts using your fingers.
• Tighten bolts evenly in a crisscross pattern using a 13mm socket.
• Final tighten with a torque wrench: Torque to 40 Nm (30 ft-lbs).

Step 9: Reconnect hoses

• Push hoses fully onto the water pump fittings by hand.
• Reposition clamps using hose clamp pliers back to their original locations.

Step 10: Reinstall the serpentine belt

• Route the belt according to the under-hood diagram.
• Rotate the tensioner using the 15mm socket, slide the belt onto the last pulley, then release the tensioner slowly.
• Visually confirm the belt ribs are seated in every pulley groove.

Step 11: Reinstall fan/shroud and intake duct

• Lower the fan/shroud into place and install fasteners using a 10mm socket.
• Reconnect the fan electrical connector(s) by hand until they click.
• Reinstall the intake duct and tighten clamps using a 10mm socket.

Step 12: Refill and bleed the cooling system

• Close the radiator drain.
• Fill the coolant reservoir using a funnel with engine coolant (OAT, 50/50 premix).
• Use a spill-free coolant funnel kit (specialty) to help burp air (this tool is a sealed funnel that lets bubbles escape without spilling).
• Reconnect the negative battery cable using a 10mm socket.
• Start the engine and set HVAC to max heat; let it idle until warm.
• Top off as the level drops, and watch for steady heat from vents (a good sign coolant is circulating).
• Shut off, let it cool, then recheck level and top off to the correct mark.

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✅ After Repair

• Check for leaks around the water pump and hose connections with the engine running.
• Verify the temperature gauge stays normal on a 10-15 minute test drive.
• After the engine cools, recheck coolant level again and top off if needed.
• Inspect the serpentine belt tracking (no wobble, no squeal).

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💰 DIY vs Shop Cost

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

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

You Save: $370-$930 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 2.5-4.0 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.