2025-04-15

Ancillary Bay Coolant (Drain and Refill)

Correction code 16202000 1.90 NOTE: Unless otherwise explicitly stated in the procedure, the above correction code and FRT reflect all of the work required to perform this procedure, including the linked procedures. Do not stack correction codes unless explicitly told to do so. NOTE: See Flat Rate Times to learn more about FRTs and how they are created. To provide feedback on FRT values, email ServiceManualFeedback@tesla.com. NOTE: See Personal Protection to make sure wearing proper PPE when performing the below procedure. See Ergonomic Precautions for safe and healthy working practices.

  • 2024-07-10: Added caution for hose reconnection.
  • 2023-07-06: Updated procedure with images and standardized instructions.
  • 1053600-00-C Drive Unit Pressure Test Fixture
  • 1132185-00-B Kit, Coolant Leak Test Adapters, Model 3
  • 1133843-00-A Kit, Coolant Drain & Fill Adapters, M3
  • 1135762-00-A Kit, Svc Plug, Cooling Hose, Model 3
  • 1065131-00-A Kit, Battery Coolant Drain and Fill

Drain

  1. Disconnect 12V power and perform the vehicle electrical isolation procedure. See 12V/LV Power (Disconnect and Connect).
  2. Remove the mid aero shield panel. See Panel - Aero Shield - Rear (Remove and Replace).
  3. Remove the rear HV battery skid plate. See Skid Plate - HV Battery - Rear (Remove and Replace).
  4. Position a coolant drain under the rear RH side of the HV battery.
  5. Release the clip, disconnect the rear powertrain supply hose from the RH underside of the ancillary bay, plug the female fitting of the hose, and allow the battery to drain.
  6. Connect the coolant pressure test adapter to the male fitting on the RH underside of the ancillary bay.
  7. On the drive unit pressure test fixture, turn both valve P2 (outlet) and valve P1 (inlet) clockwise to close.
  8. Turn the pressure regulator knob counter-clockwise many turns so that it is loose, to close.
  9. Connect the supply air hose to the right side of the drive unit pressure test fixture.
  10. Turn valve P1 (inlet) counter-clockwise to open.
  11. Power on the pressure gauge, and then turn the pressure regulator knob clockwise to set the pressure to 50 PSI.
    Informational PurposesAn informational icon, calling your attention
    Note
    If 50 PSI is not attainable, 48 PSI or 49 PSI is sufficient.
  12. Connect and hand-tighten the outlet air hose to the left side of the drive unit pressure test fixture.
  13. Connect and hand-tighten the outlet air hose from the drive unit pressure test fixture to the coolant pressure test adapter.
  14. Position the coolant drain under the rear LH side of the HV battery.
  15. Release the clip, disconnect the rear drive unit inverter inlet hose from the male fitting on the LH underside of the ancillary bay, plug the female fitting of the hose, and allow the battery to drain.
  16. Connect the 90 degree coolant drain adapter to the male fitting on the LH underside of the ancillary bay.
  17. Connect the coolant drain hose to the 90 degree coolant drain adapter, and route the end of the hose to the coolant waste container.
  18. If the coolant waste container is a bottle, push a shop towel partially into the bottle neck, to prevent coolant from splashing out.
  19. Set the timer for 2 minutes.
  20. Slowly turn valve P2 (outlet) counter-clockwise to open and start the timer.
    Informational PurposesAn informational icon, calling your attention
    Note
    Monitor the coolant drain and mitigate any splashing.
  21. When the timer completes, turn valve P2 (outlet) clockwise to close.
  22. Press the grey button to disconnect the coolant drain hose from the 90 degree coolant drain adapter.
  23. Release the clip to disconnect the 90 degree coolant drain adapter from the male fitting on the LH underside of the ancillary bay.
  24. Release the clip to disconnect the coolant pressure adapter and outlet air hose together from the male fitting on the RH underside of the ancillary bay.
  25. Fasten the clip, and then connect the 180 degree coolant drain adapter to the male fitting on the RH underside of the ancillary bay.
  26. Connect the coolant drain hose to the coolant drain adapter.
  27. Fasten the clip, and then connect the coolant pressure adapter and outlet air hose together to the male fitting on the LH underside of the ancillary bay.
  28. Set the timer for 2 minutes.
  29. Slowly turn valve P2 (outlet) counter-clockwise to open and start the timer.
    Informational PurposesAn informational icon, calling your attention
    Note
    Monitor the coolant drain and mitigate any splashing.
  30. When the timer completes, turn valve P2 (outlet) clockwise to close.
  31. Release the clip to disconnect the coolant pressure adapter and outlet air hose together from the male fitting on the LH underside of the ancillary bay.
  32. Press the grey button to disconnect the coolant drain hose from the 180 degree coolant drain adapter.
  33. Release the clip to disconnect the 180 degree coolant drain adapter from the male fitting on the RH underside of the ancillary bay.
  34. Return to the service procedure that required the ancillary bay coolant to be drained.
    Warning IconA warning icon, calling your attention to a possibly risky situation
    CAUTION
    Leave all hoses disconnected and plugged. Do not reconnect any hoses at this time.
  35. After the components have been replaced, refill the coolant. See Refill.

Refill

  1. Perform an ancillary bay coolant leak test. See Ancillary Bay Coolant Leak Test.
  2. Position the coolant drain under the rear RH side of the HV battery.
  3. Remove the plug from the rear powertrain supply hose, connect the hose to the male fitting on the RH underside of the ancillary bay, fasten the clip, and then perform a Push-Pull-Push test of the fitting.
  4. Position the coolant drain under the rear LH side of the HV battery.
  5. Remove the plug from the rear drive unit inverter inlet hose, connect the hose to the male fitting on the LH underside of the ancillary bay, fasten the clip, and then perform a Push-Pull-Push test of the fitting.
  6. Remove the coolant drain from under the vehicle.
  7. If the ancillary bay cover was removed as part of another procedure, inspect the coolant input and output tubes and fittings for leaked coolant.
  8. Install the rear HV battery skid plate. See Skid Plate - HV Battery - Rear (Remove and Replace).
  9. If the ancillary bay coolant refill was requested by another service procedure, return to that procedure.
  10. Install the mid aero shield panel. See Panel - Aero Shield - Rear (Remove and Replace).
  11. Connect 12V power. See 12V/LV Power (Disconnect and Connect).
  12. Perform a vacuum refill of the cooling system. See Cooling System (Vacuum Refill).