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Service procedures 2026 firmware

Coolant Air Purge

ModelSX/tasks/PROC_THC_X_COOLANT-AIR-PURGE

What this task does

Powers the accessory rail and runs HVAC pumps at maximum speed, changing the valve positions. Estimated time to complete is 20 minutes. To exit the routine early, run this routine again with STOP as the input.

Vehicle & firmware coverage

Open a version to see its description, requirements, and input definitions. Hardware configuration and live vehicle checks also determine availability.

Model S / X (legacy) Legacy infotainment · Firmware 2026.14.6
Vehicle coverage
Pre-2021 Model S, Pre-2021 Model X
Supported connection
Local connection
Vehicle state
Stationary · Parked
Gateway diagnostic level
DiagLinkActive, Factory, Service

Procedure notes

The Thermal Controller (THC) will continue to run coolant air purge until it completes or is requested to stop. Exiting this modal or cancelling the routine will not affect the THC's coolant air purge routine.

Task inputs (2)

Coolant Air Purge Control

mode · String

START will start the routine and poll for results, STATUS returns the current active status, STOP will stop the routine if it is running.

Firmware default: START

Options: START, STATUS, STOP

Wait for Routine Finish

poll · Bool

If selected, the routine will continue to poll the status of the coolant air purge routine on the THC and return success upon completion.

Firmware default: true

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Service procedures

Louver Calibration

Runs the ModelS front louver calibration after actuator replacement. And returns the calibration status of all four louvers.

PROC_THC_X_LOUVER-CALIBRATION

Model S / X (legacy)
Service procedures

Start Thermal System Test

Start thermal system test. It proceeds for 5 minutes.

PROC_THC_X_THERMAL-TEST-START

Model S / X (legacy)
Service procedures

Start Thermal System Test with Precondition

Start thermal system test with precondition. It preconditions if needed, and then proceeds for 5 minutes to run thermal system test.

PROC_THC_X_THERMAL-TEST-START-PRECONDITION

Model S / X (legacy)
Communication checks

THC CAN Communication

Tests communication with the Thermal Controller for Supercharger (THC) Electronic Control Unit (ECU). Communication is established via Unified Diagnostics Services (UDS) over the Controller Area Network (CAN).

PING-TP_THC

Model S / X (legacy)