Tesla Model 3: Inverter Coolant Leak Test
DRAFT
Warning:
This procedure was derived from pre-production computer
models, and might not reflect the real-world situation. Warnings
and cautions might be missing. Follow safety requirements and
use extreme caution when working on or near high voltage systems
and components.
SPECIAL TOOLS
Drive Unit Pressure Test Fixture (1053600-00-C)
Kit, Coolant Leak Test Adapters, Model 3
(1132185-00-B)
Kit, Coolant Drain & Fill Adapters, M3
(1133843-00-A)
Kit, Svc Plug, Cooling Hose, Model 3 (1135762-00-A)
Procedure
Disconnect 12V power. See 12V Power (Disconnect and
Connect).
Remove the mid aero shield panel. See Panel - Aero
Shield - Mid (Remove and Replace).
Position a coolant drain under the inverter.
Disconnect the coolant outlet hose at the top of the
inverter.
Plug the female fitting of the hose, and connect the
coolant pressure test adapter to the inverter.
Connect the drive unit pressure test fixture to the
coolant pressure test adapter.
Close both valves P1 (inlet) and P2 (outlet) on the test
fixture, and connect a compressed air supply line.
Fully close the regulator, and then open P1 (inlet
valve).
Set the pressure regulator of the test fixture to 26
psi.
Disconnect the coolant inlet hose at the bottom of the
inverter, plug the female fitting of the hose, and allow the
inverter to drain.
Connect the coolant drain adapter to the bottom of the
inverter, and direct the tube to the coolant drain.
Slowly open P2 (outlet valve) to speed the drain, and
then close P2 (outlet valve).
Disconnect the coolant drain adapter, and then connect
the coolant pressure test adapter plug to the inverter.
Open P2 (outlet valve) again, and allow at least 45
seconds for the pressure to stabilize to 26 psi.
Close P1 (inlet valve), record the starting pressure
displayed, and start a 4 minute timer.
After 4 minutes record the ending pressure displayed.
Subtract the ending pressure from the starting pressure,
and if:
The difference greater than 0.2 psi, check the hose,
adapter, and plug fittings, close P2 (outlet valve) and
open P1 (inlet valve), check the regulator pressure, and
then retest from step 14. If the difference is still
greater than 0.2 psi, escalate a Toolbox session.
The difference is 0.2 psi or less, continue the
procedure.
Disconnect the air supply from the test fixture.
Open P1 (inlet valve), and disconnect the test fixture
from the coolant pressure test adapter.
Remove the coolant pressure test adapter and coolant
pressure test adapter plug from the inverter, and the plugs
from the hoses.
Connect the hoses to the inverter.
Caution:
Perform a push-pull test to verify that the hose is
fully seated.
Remove the coolant drain from under the vehicle.
Install the mid aero shield panel. See Panel - Aero
Shield - Mid (Remove and Replace).
Connect 12V power. See 12V Power (Disconnect and
Connect).
Perform a vacuum refill the cooling system. See Cooling
System (Vacuum Refill).
READ NEXT:
Inverter - Rear Drive Unit - Remove
SPECIAL TOOLS
Skt, 3/8in Dr, 10EP Torx Plus External (1130479-00-A)
SEE MORE:
Remove
Remove the LH center console side panel carpet. See
Carpet - Side Panel - Center Console - LH (Remove and
Replace).
Disconnect 12V power. See 12V Power (Disconnect
Remove
Use Toolbox to put the vehicle into Factory Mode.
Invoke diagnostics on the touchscreen.
Inspect the Notifications for either a BMS_a123 or a BMS_W123 alert.
If:
Either alert is present - Contact Service Engineering. Do not perform
this procedure.
Neither alert is present - Continu
Inverter - Rear Drive Unit (Remove and
Install)
