Replacement of an EV coolant pump on a 2024 Model S Plaid Tri-Motor. This vehicle uses an integrated thermal loop (heat pump, octovalve, superbottle) shared between the HV battery, drive units, and cabin — this is a PROFESSIONAL-ONLY procedure requiring Tesla Toolbox software access and Tesla-certified training. Coolant inspection is also recommended at 4 years / 50,000 mi per Tesla's current guidance.

Warnings

Tools required

Parts

• EV coolant pump (manufacturer-specified for Model S Plaid) × 1 — Tesla OEM — verify by VIN
• Coolant pump O-rings / seals (if supplied separately) × 1 — OEM seal kit for the specified pump
• Replacement spring hose clamps (if damaged on removal) × 2 — OEM-equivalent constant-tension clamps

Fluids

• Tesla Battery/Motor Coolant (G-48 spec) — DO NOT mix with conventional coolants — 10 qt

Preparation

1. Park on level ground, place in P, and engage the parking brake.
2. Exit ALL doors with the key fob/phone key carried away from the vehicle. Wait at least 2 minutes for HV systems to fully de-energize, even on this non-HV job.
3. Disconnect the low-voltage battery: on this 2024 Plaid, the 16V lithium auxiliary battery is located under the rear seat (verify by VIN — some Plaid units retain the frunk-mounted unit). Follow the Tesla-specified disconnect procedure.
4. DO NOT touch, cut, or pierce ANY orange cable — these are high-voltage and lethal.
5. If at any point you encounter an orange cable, an HV component, or are unsure if a system is de-energized: STOP and consult a Tesla-certified technician.
6. Connect Tesla Toolbox and place the vehicle in Service Mode. Use Toolbox to depressurize and isolate the relevant coolant loop section before opening any line.
7. Allow the vehicle to cool fully (minimum 1 hour after last drive) — coolant in the heat pump loop can be hot and pressurized.
8. Raise vehicle on a lift using Tesla-specified lift pad locations (jack pucks) to avoid battery pack damage.

Procedure

1. 1

   Identify the correct coolant pump and loop
   Model S Plaid has multiple electric coolant pumps within the integrated thermal system (battery loop, powertrain loop, and the heat pump circuit). Use Toolbox to identify which pump is being replaced (DTC, location, and loop assignment). Confirm the part number against the VIN before proceeding.
   ⚠Replacing the wrong pump or guessing at loop identity can introduce air into the battery loop and cause thermal runaway risk.
2. 2

   Depressurize and isolate the loop with Toolbox
   Using Tesla Toolbox, run the coolant loop depressurization / isolation routine for the affected loop. Confirm pressure drops to ambient before continuing. Do not rely on visual or manual checks alone.
   ⚠️Improper depressurization can spray hot coolant onto HV battery components. Damage to the HV pack (~$15,000+) and risk of HV short are real consequences. Toolbox is required.
3. 3

   Access the pump location
   Depending on which pump is being replaced, remove the relevant access panel: frunk tub, underbody aero shield, or rear underhood cover. Use plastic trim tools where possible to avoid scratching aluminum panels. Set fasteners aside in labeled trays.
   Torque spec

   Cover Screws11 Nm (8 lb-ft)
4. 4

   Position drain catch and prepare to break the loop
   Place a clean coolant catch pan beneath the pump. Have lint-free towels ready to capture residual coolant. Verify no orange HV cabling is in the spill path; if so, drape with insulating barrier and reroute the catch pan.
   ⚠️Coolant contacting HV connectors or pack vents can damage the HV battery and create a shock hazard. Stop if any orange cabling is in the spill path.
5. 5

   Disconnect electrical connector to the pump
   Release the locking tab on the low-voltage connector at the pump and disconnect. Inspect pins for corrosion or coolant intrusion. Tape the connector clear of the work area.
   Torque spec

   Connector Bolts7 Nm (5 lb-ft)
6. 6

   Release coolant line clamps and disconnect lines
   Using hose clamp pliers, slide spring clamps back from the pump inlet and outlet. Gently rotate hoses to break the seal and disconnect, allowing residual coolant to drain into the catch pan. Cap or plug the open hoses to prevent contamination and further drip.
   ⚠️Opening the loop on the battery side without prior Toolbox isolation can vent coolant into the HV pack. Confirm isolation before disconnecting.
   ⚠Inspect clamps for fatigue. Replace any clamp that does not return to full tension.
   Torque spec

   Hose Clamps3 Nm (2 lb-ft)

   Coolant Line Fittings15 Nm (11 lb-ft)
7. 7

   Remove pump mounting hardware
   Support the pump body, then remove the bracket bolts and/or mounting bolts securing it to the chassis or subframe. Note orientation and any isolation grommets — these must be reused or replaced exactly as fitted.
   Torque spec

   Bracket Bolts20 Nm (15 lb-ft)

   Mounting Bolts27 Nm (20 lb-ft)
8. 8

   Remove failed pump
   Withdraw the pump from its mount. Drain residual coolant from the pump body into the catch pan. Inspect the removed pump for impeller damage, debris, or signs of internal coolant contamination — debris in the loop indicates a downstream problem (heat exchanger, octovalve) that must be investigated before refilling.
   ⚠If metallic debris or oily residue is present in the coolant, do NOT proceed with a simple pump swap — the loop may require flushing and the octovalve/heat exchanger inspected. This is beyond a pump replacement.
9. 9

   Install new pump
   Verify the new pump matches the removed unit (part number, port orientation, connector keying). Install new O-rings/seals if supplied. Set the pump into the bracket and hand-start all mounting hardware before final torque.
   Torque spec

   Bracket Bolts20 Nm (15 lb-ft)

   Mounting Bolts27 Nm (20 lb-ft)
10. 10

    Torque mounting hardware to specification
    Torque bracket bolts and mounting bolts using a calibrated torque wrench. For any fastener not on the verified torque list, torque to OEM specification — refer to Tesla Service Manual.
    Torque spec

    Bracket Bolts20 Nm (15 lb-ft)

    Mounting Bolts27 Nm (20 lb-ft)
11. 11

    Reconnect coolant lines and electrical connector
    Reseat hoses fully onto the pump barbs and slide spring clamps back into their factory positions. Reconnect the LV electrical connector until you hear/feel the lock engage. Verify routing matches OEM and is clear of moving or hot components.
    ⚠️A poorly seated hose can leak coolant onto the HV battery. Verify clamp position and hose seating before pressurizing.
    Torque spec

    Hose Clamps3 Nm (2 lb-ft)

    Coolant Line Fittings15 Nm (11 lb-ft)

    Connector Bolts7 Nm (5 lb-ft)

Reassembly

1. Reinstall any covers, shields, or trim panels removed for access. Torque cover screws to specification.
2. Refill the coolant loop using a Tesla-approved vacuum-fill tool with Tesla Battery/Motor Coolant (G-48 spec). Do NOT mix coolant types.
3. Run the Toolbox-guided coolant fill and bleed procedure for the specific loop serviced. This is mandatory — manual bleeding will leave air pockets that can damage the HV battery cooling.
4. Reconnect the low-voltage (16V/12V) auxiliary battery.
5. Exit Service Mode in Toolbox and clear any related DTCs.
6. Reinstall frunk liner / underbody aero shields / rear cover as applicable.

Verification

• With Toolbox connected, command the replaced pump on and verify flow rate / RPM feedback against expected values.
• Cycle the climate system (both heat and AC) and battery preconditioning to exercise the heat pump and octovalve; monitor coolant pressures and temperatures in Toolbox for at least one full thermal cycle.
• Visually inspect every joint opened during the procedure for leaks after the system has been pressurized and warmed.
• Confirm no DTCs return after a 15-minute idle and a short test drive.
• Check coolant reservoir level after the test drive and top off to the correct cold-fill mark with Tesla-spec coolant only.
• Document the service date and mileage. Tesla recommends battery coolant inspection at 4 years / 50,000 mi — note the next inspection interval in the customer record.

More procedures for this vehicle