How to Replace Water Pump 03-08 Dodge Ram

Difficulty: Advanced · About 120 min · Dodge Ram

Replace the water pump and thermostat on a 2003–08 Dodge Ram, removing the fan and shroud and bleeding the cooling system after refill.

Steps

1. Drain the cooling system

   Let the engine cool completely, drain coolant into a pan, then close the drain. Keep coolant off painted surfaces and dispose of it properly.

2. Remove the fan and hoses

   Loosen the fan clutch using the correct holding tools, then remove the fan and upper radiator hose. Move the washer reservoir and fan shroud aside to expose the pump.

3. Remove belt and water pump

   Record the serpentine belt route and release tension to remove it. Disconnect heater hoses, remove the idler as needed, and take out the pump bolts, keeping their positions organized.

4. Replace the thermostat

   Remove the thermostat housing and inspect the thermostat and seal. Install the replacement in the correct orientation and refit the housing to specification.

5. Prepare the pump mounting surface

   Remove old gasket material without scratching the engine surface. Clean the area and verify coolant passages are clear before installing the new pump gasket.

6. Install pump and belt

   Fit the new water pump and gasket, start all bolts by hand, and tighten them evenly to the vehicle's specification. Reinstall hoses, idlers, tensioner, and belt using the routing diagram.

7. Reinstall fan and shroud

   Return the fan shroud and fan to their mounts and tighten fasteners securely. Reconnect reservoir and coolant hoses and confirm clamps are correctly positioned.

8. Refill and bleed coolant

   Close the drain and fill with the specified coolant. Bleed air using the vehicle procedure while monitoring temperature, then let the engine cool and recheck the level and for leaks.

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