How To Replace Water Pump 2.8L 03-10 Cadillac CTS

Difficulty: Advanced · About 120 min · Cadillac Cts

Replace the water pump on a 2003–2010 Cadillac CTS 2.8L and refill and bleed the cooling system after reassembly.

Tools you will need

Drain the cooling system
Work only on a completely cold engine. Remove the reservoir cap slowly, raise and support the vehicle if needed, remove the underbody panels, and drain coolant into a suitable pan. Close the drain after flow stops.
Move the intake and release the belt
Remove the engine cover and intake box after disconnecting its hoses and loosening the clamps. Relieve tension at the belt tensioner, remove the belt while noting its routing, and slowly release the tensioner.
Remove the pump and clean the surface
Remove the pulley fasteners and pulley, then remove the water pump bolts and withdraw the pump. Capture remaining coolant, remove the old gasket, and clean the mounting face without gouging it.
Install the new pump
Position the new pump with its gasket correctly aligned and start every bolt by hand. Tighten the bolts evenly to the vehicle specification, then reinstall the pulley and its fasteners.
Reinstall the belt and intake
Route the belt according to the underhood diagram, release the tensioner, and verify the belt sits squarely in each groove. Refit the intake box, hoses, clamps, engine cover, and underbody panels.
Refill and bleed the cooling system
Fill with the specified coolant and bleed air using the vehicle's service procedure. Run the engine while monitoring temperature and leaks, allow it to cool fully, then recheck the reservoir level and top up as needed.

Check your vehicle’s repair manual for exact specifications and fit.