These step-by-step instructions and video explain a water pump replacement on a 2003 Chevy Avalanche 1500, and will be similar to replacement procedures on Chevy Avalanche 1500 models from 2002, 2003, 2004, 2005, and 2006. The replacement procedures will also be similar for select Chevy Silverado 1500 models from 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, and 2007, Chevy Silverado 2500 models from 1999 to 2006, and Chevy Silverado 3500 models from 2001 to 2006, as well as Cadillac Escalade models from 2002, 2003, 2004, 2005, and 2006 equipped with a V8 Vortec engine. Replacing a damaged or failing water pump can help your truck’s engine stay cool, and can improve engine performance. If you notice your truck is leaking coolant, overheating, or if you see steam from underneath the hood, you should inspect and replace your Avalanche’s water pump to prevent engine overheating.
Supplies Needed for This Job:
1. Safety Glasses: https://urlzs.com/hbwc
2. Gloves: https://bit.ly/2GvfwAm
3. Waterpump: https://bit.ly/2Lgb36p
4. Coolant: http://bit.ly/2IWlyvD
5. Drain Pan: http://bit.ly/2GEzWqK
6. Ratchet and Sockets: http://bit.ly/2IEAOOi
7. Fan Clutch Wrench: http://bit.ly/33wnpzt
8. C-Clamp: https://bit.ly/2AeabwI
0:00 Welcome Back
0:46 Drain the Coolant
1:14 Remove the Engine Cover
1:25 Remove Air Duct
1:38 Detach the Upper Hose
1:50 Remove Fan Shroud
2:18 Remove the Fan
2:31 Remove the Belt
3:04 Remove the Tensioner
3:16 Detach Lower Hoses
3:43 Remove the Thermostat
3:52 Remove the Old Waterpump
4:05 Install the New Waterpump
4:24 Reinstall the Thermostat
4:34 Reinstall Lower Hoses
4:51 Reinstall the Belt
5:10 Reinstall Fan Blade & Shroud
5:21 Reinstall Upper Hose
5:35 Reinstall Removed Items
6:00 Refill the Coolant
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Your Chevy Avalanche 1500’s water pump is a crucial part of your engine’s cooling system. Your truck’s water pump moves coolant throughout the engine to keep it within normal operating temperatures and to prevent it from overheating. Replacing a faulty or failing water pump on your 2003 Chevy Vortec 5.3-liter V8 engine is a straightforward repair that can help ensure your truck’s cooling system is functioning properly. If you need to replace your truck’s water pump, you may see coolant leaks underneath the middle-front of your vehicle, steam coming from under the hood, the bearing in the water pump could fail, or your Chevy may overheat. A sign that the water pump pulley is about to fail includes hearing a squeaking sound coming from the water pump pulley. It is important to replace a failing water pump as soon as possible to prevent your truck from overheating and causing engine damage. Our step-by-step instructions will help you perform a water pump replacement on your Chevy Avalanche.
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Start by parking on a level surface… letting the vehicle cool… and disconnecting the negative battery cable.
Slowly rotate the surge tank fill cap counterclockwise.
Stop rotating and allow the hissing to stop.
After all hissing stops, continue turning counterclockwise to remove the cap.
Put a drain pan in place… and open the petcock.
Allow the system to drain completely.
Close the radiator petcock.
Loosen the air cleaner outlet duct clamps at the throttle body… and mass airflow/intake air temperature sensor.
Remove the radiator inlet hose clip from the outlet duct.
Then remove the air cleaner outlet duct.
Take off the engine cover by loosening the intake manifold sight shield bolt.
Remove the cover from the cover retainer.
Then remove the cover retainer bolts and the retainer, if required.
Detach the radiator vent inlet hose from the radiator hose clips.
Loosen the inlet hose clamp and remove the inlet hose from the water pump.
If equipped, remove the throttle body heater hose retainer and the inlet radiator hose retainer from the fan shroud.
**View full video for complete instructions**