This procedure covers the removal and replacement of the EV coolant pump on a 2024 Rivian EDV 500 Dual Motor AWD, including coolant system drainage, pump access, and refilling with proper bleeding.

Warnings

Tools required

Parts

• EV coolant pump assembly × 1 — Use OEM Rivian specification
• Coolant pump O-ring seal kit × 1 — Use OEM specification
• Coolant hose clamps × 4 — Use OEM specification
• Underbody panel fasteners × 1 — Replacement clips as needed

Fluids

• EV Battery/Motor Coolant — 10 qt

Preparation

1. Park vehicle on level surface and engage parking brake
2. Allow vehicle to cool for minimum 2 hours after last operation
3. Disconnect 12V auxiliary battery using manufacturer-approved lockout procedure
4. Verify HV system is de-energized using Rivian diagnostic tool (look for 0V on HV bus)
5. Place high voltage lockout tag on driver's seat
6. Raise vehicle on lift or support safely on jack stands at manufacturer-specified lift points
7. Remove front underbody panels to access coolant pump location in front motor compartment
8. Place large drain pan under front motor assembly coolant pump area

Procedure

1. 1

   Access coolant system drain valve
   Locate the primary coolant drain valve on the lower coolant reservoir or drain point nearest the front motor assembly. Remove the drain plug slowly to release any residual pressure, then open valve completely to drain coolant into collection pan. Allow system to drain for at least 15 minutes.
2. 2

   Disconnect coolant pump electrical connector
   Locate the coolant pump electrical connector on the pump housing. Depress the locking tab and disconnect the harness connector. Secure the harness away from the work area using a zip tie or mechanical support to prevent damage during pump removal.
3. 3

   Remove inlet coolant hose
   Using hose clamp pliers, release the spring clamp or loosen the worm-drive clamp securing the inlet coolant hose to the pump. Have a small drain pan ready as residual coolant will drain from the hose. Carefully twist and pull the hose from the pump inlet port. Inspect the hose end for damage or degradation.
4. 4

   Remove outlet coolant hose
   Release the clamp securing the outlet coolant hose to the pump discharge port using the same method as the inlet. Remove the hose from the pump, capturing any remaining coolant. Cap or plug both hoses temporarily to prevent contamination and further dripping.
5. 5

   Remove coolant pump mounting fasteners
   Identify and remove all mounting bolts securing the coolant pump to its bracket or motor housing. The EDV 500 typically uses 3-4 mounting bolts. Support the pump with one hand while removing the final fastener to prevent it from falling.
6. 6

   Extract coolant pump assembly
   Carefully maneuver the coolant pump out of its mounting location, being mindful of any remaining coolant lines or wiring in the area. Rotate or tilt the pump as needed to clear any obstructions. Once clear, place the old pump on a clean work surface for inspection.
7. 7

   Inspect mounting area and prepare surfaces
   Clean the pump mounting surfaces on the bracket or motor housing using a lint-free cloth. Inspect for corrosion, damage, or coolant residue. Check the mounting bolt holes for thread damage. Verify the electrical connector mounting point is clean and free of corrosion.
8. 8

   Prepare new coolant pump
   Unpack the new coolant pump and verify it matches the original unit exactly. Install new O-rings onto the pump inlet and outlet ports, lubricating them lightly with fresh EV coolant. Verify the electrical connector gasket or seal is properly seated. Do not remove any protective caps until ready to connect hoses.
9. 9

   Install new coolant pump
   Position the new coolant pump into the mounting location, aligning the mounting holes. Thread all mounting bolts by hand first to ensure proper alignment. Tighten the mounting bolts in a star pattern to ensure even seating. Since no torque specifications are provided in the database, tighten securely but avoid over-torquing the aluminum housing.
10. 10

    Connect coolant hoses
    Remove protective caps from pump ports. Connect the inlet coolant hose first, ensuring it seats fully onto the port with the O-ring visible inside the hose. Install a new clamp and secure it properly. Repeat for the outlet hose. Ensure both hoses are routed without kinks or sharp bends.
11. 11

    Reconnect electrical connector
    Connect the electrical harness to the coolant pump, ensuring the connector seats fully and the locking tab clicks into place. Gently tug the connector to verify it is secure. Check that the wiring is routed away from any sharp edges or heat sources.
12. 12

    Refill coolant system
    Close all drain valves. Using the specified EV Battery/Motor Coolant, slowly refill the system through the coolant reservoir fill point. Fill to the cold fill line initially. Pause periodically during filling to allow air to escape from the system. Total capacity is approximately 10 quarts but may vary based on what was drained.
13. 13

    Perform initial system bleeding
    With coolant filled to the proper level, reconnect the 12V battery. Using Rivian diagnostic software, activate the coolant pump bleeding function. This will run the pump at various speeds to purge air from the system. Monitor coolant level and add fluid as needed during this process. Continue until no air bubbles are visible in the reservoir.
14. 14

    Pressure test and leak inspection
    Using the diagnostic tool, run the thermal management system through a test cycle. Carefully inspect all connections at the coolant pump for leaks while the system is under pressure. Check for coolant seepage at hose connections, mounting points, and the pump shaft seal. Wipe all connections and observe for several minutes.
15. 15

    Reinstall underbody panels and finalize
    Once leak-free operation is confirmed, reinstall all underbody panels and fasteners removed during access. Torque panel fasteners to specification if available. Remove the high voltage lockout tag. Lower the vehicle to the ground. Top off coolant to the cold fill line if needed after system has fully bled.

Reassembly

1. Ensure all coolant hose clamps are properly secured and oriented for serviceability
2. Verify electrical connector is fully seated with locking tab engaged
3. Confirm all underbody panels are reinstalled with proper fasteners
4. Double-check that no tools or materials have been left in the motor compartment
5. Verify coolant level is at the cold fill line before returning vehicle to service

Verification

• Using Rivian diagnostic software, verify coolant pump operation and flow rate meets specification
• Confirm no diagnostic trouble codes related to thermal management system
• Run vehicle through a thermal cycle (approximately 30 minutes of operation) and recheck coolant level
• Perform final leak inspection at all coolant pump connections after thermal cycle
• Verify proper coolant temperature regulation during normal operation using diagnostic tool
• Test drive vehicle and confirm no thermal management warnings or error messages appear
• Recheck coolant level after 24 hours of normal operation and top off if necessary

More procedures for this vehicle