Replacement of the EV coolant pump on a 2024 Model X Plaid. This is a PROFESSIONAL-ONLY procedure: the pump is part of Tesla's integrated thermal loop (battery, drive unit, and cabin heat share coolant via the octovalve/superbottle), and Tesla Toolbox is required to safely depressurize and bleed the system. Battery coolant should be inspected at 4 years / 50,000 mi per Tesla's current guidance.

Warnings

Tools required

Parts

• EV coolant pump assembly (manufacturer-specified for Model X Plaid) × 1 — Tesla OEM coolant pump — verify by VIN
• Coolant line O-rings / quick-connect seals (as applicable to pump fittings) × 1 — OEM seal kit for pump fittings
• Hose clamps (replace if spring-type are fatigued) × 2 — OEM-equivalent spring clamps

Fluids

• Tesla Battery/Motor Coolant (G-48 spec) — 10 qt

Preparation

1. Park on level ground, shift to P, and engage the parking brake.
2. Exit ALL doors with the key fob carried well away from the vehicle. Wait at least 2 minutes for HV systems to fully de-energize.
3. Open the frunk and disconnect the 12V low-voltage battery (frunk-mounted, similar position to Model S). Insulate the negative terminal so it cannot reseat.
4. DO NOT touch, cut, or pierce ANY orange cable — these are high-voltage and lethal. If you encounter an orange cable, an HV component, or are unsure if a system is de-energized: STOP and consult a Tesla-certified technician.
5. Connect Tesla Toolbox 3 and command 'Service Mode' / coolant system depressurization for the affected loop. Confirm pressure is bled per Toolbox prompts before opening any fitting.
6. Through Toolbox, disable falcon door auto-present and lock the doors in the closed position for the duration of the service.
7. Raise the vehicle on a lift rated for Model X curb weight, or support securely on jack stands at OEM lift points. Air suspension must be set to Jack Mode via the touchscreen before lifting.
8. Identify the coolant pump location and trace the lines it serves. Verify which loop (battery, drive unit, or PTC/heat-pump branch) is involved before disconnecting anything.
9. Stage a coolant catch pan directly beneath the pump and protect any nearby HV components and the battery pack seam with plastic sheeting.

Procedure

1. 1

   Confirm loop depressurization via Toolbox
   With Tesla Toolbox connected, run the cooling system depressurization routine for the loop containing the failed pump. Confirm on the Toolbox screen that residual pressure is at zero before proceeding. Do not rely on touch or visual cues alone.
   ⚠️Opening a pressurized line that shares plumbing with the HV battery can spray coolant onto HV components. HV battery damage can exceed $15,000 to repair.
2. 2

   Remove access covers / underbody shielding
   Remove the underbody aero shield and any access covers required to reach the coolant pump. Note fastener locations — Model X uses a mix of plastic clips and machine screws. Keep hardware organized.
   Torque spec

   Cover Screws11 Nm (8 lb-ft)
3. 3

   Drain affected coolant loop
   Position the catch pan and open the manufacturer-specified drain point for the affected loop. Drain coolant fully. Inspect drained fluid for contamination, metallic particles, or oil — any of these indicate a deeper failure that must be diagnosed before refilling.
   ⚠️Coolant must not contact HV battery seams, orange cabling, or HV connectors. Improper handling can damage the HV battery (~$15,000+) and create a shock hazard.
4. 4

   Disconnect electrical connector to pump
   Locate the low-voltage connector on the coolant pump. Release the connector lock and unplug. Inspect terminals for corrosion or coolant intrusion — coolant in the connector indicates pump seal failure and possible upstream contamination.
5. 5

   Disconnect coolant lines from pump
   Using hose clamp pliers, release the spring clamps (or unlock the quick-connect fittings, depending on configuration) on the inlet and outlet lines. Slide hoses off the pump barbs slowly to allow residual coolant to drain into the catch pan. Cap the open hose ends to prevent debris entry.
   ⚠️This step breaks Tesla's integrated thermal loop. Any coolant migration toward the HV battery or orange cabling is unacceptable — stop and reassess if drips are not contained. HV battery damage can exceed $15,000.
   Torque spec

   Hose Clamps3 Nm (2 lb-ft)

   Coolant Line Fittings15 Nm (11 lb-ft)
6. 6

   Remove pump mounting hardware
   Remove the pump's mounting bolts and any bracket-to-chassis bolts as required to free the pump. Support the pump as the last fastener is removed so it does not fall.
   Torque spec

   Mounting Bolts27 Nm (20 lb-ft)

   Bracket Bolts20 Nm (15 lb-ft)
7. 7

   Remove old pump and inspect mounting area
   Withdraw the failed pump from the bay. Inspect the mounting bracket, isolators (if equipped), and surrounding hoses for damage, swelling, or coolant staining. Replace any degraded hoses now — accessing them again is expensive labor.
8. 8

   Install new pump
   Position the new manufacturer-specified pump into the bracket. Install mounting bolts finger-tight first to allow alignment, then torque to specification. Ensure the pump's flow-direction arrow (if present) matches the original orientation.
   Torque spec

   Mounting Bolts27 Nm (20 lb-ft)

   Bracket Bolts20 Nm (15 lb-ft)
9. 9

   Reconnect coolant lines
   Install new O-rings/seals where applicable. Seat hoses fully onto the pump fittings and install hose clamps in their original positions. For threaded fittings, torque to OEM specification. Verify quick-connect locks are fully seated with an audible click and a pull-test.
   ⚠️An incorrectly seated fitting can leak coolant onto HV components in service. Verify each connection twice. HV battery damage from coolant intrusion is not covered as a wear item.
   Torque spec

   Hose Clamps3 Nm (2 lb-ft)

   Coolant Line Fittings15 Nm (11 lb-ft)
10. 10

    Reconnect pump electrical connector
    Plug the LV connector back into the pump. Confirm the lock tab engages fully. Route the harness clear of hot or moving components.
11. 11

    Vacuum-fill and refill the coolant loop
    Using a vacuum-fill tool, pull the loop down to the manufacturer-specified vacuum and verify it holds (leak check). Then draw in fresh Tesla Battery/Motor Coolant (G-48). Quantity varies by which sub-loop was opened — fill until the system is at spec and Toolbox reports correct level.
    ⚠Do not substitute non-G-48 coolant. Incorrect coolant chemistry can damage seals throughout the integrated thermal loop.
12. 12

    Run Toolbox bleed/prime routine
    With the 12V battery reconnected and the vehicle in Service Mode, run the Toolbox-guided coolant bleed and pump prime routine. The routine cycles the new pump and the octovalve to purge air. Monitor for unusual noise, error codes, or pressure anomalies.
    ⚠️Skipping the Toolbox bleed routine can leave air pockets that overheat the HV battery or drive unit. Do not return the car to service without a clean bleed log.

Reassembly

1. Reinstall any removed underbody shields and covers; torque cover screws to spec.
2. Reconnect the 12V battery in the frunk; close the frunk.
3. Take the vehicle out of Jack Mode and Service Mode via the touchscreen / Toolbox.
4. Re-enable falcon door auto-present functionality in Toolbox.
5. Clean any coolant residue from the underbody and dispose of used coolant per local hazmat regulations.

Verification

• Confirm zero diagnostic trouble codes (DTCs) related to the cooling system, pump, or thermal management in Toolbox.
• With the vehicle running, monitor pump RPM and coolant flow telemetry in Toolbox — values should match expected ranges for the commanded thermal mode.
• Run a thermal stress check: use Toolbox to command max battery cooling and confirm temperature delta develops correctly across the loop.
• Inspect every disturbed fitting and clamp visually after a 10-minute idle and after a short test drive — there must be zero seepage.
• Cycle the falcon doors and confirm normal operation.
• Document coolant change date/mileage. Tesla's current guidance is to inspect battery coolant at 4 years / 50,000 mi; note this in the service record so the next inspection is scheduled correctly.

More procedures for this vehicle