Based on a video by DoDo Tesla.

The autopilot ECU sits at almost the highest point of your Tesla's coolant loop, so any air trapped in the system pools right around it. Threads on Tesla Owners Online and Tesla Motors Club describe the exact failure mode: the computer climbs to 80-90°C, then throttles or shuts down — taking cameras, GPS, cruise control and automatic emergency braking with it. The fix is a 15-minute factory bleed routine you can run yourself from Service Mode, and it is the same procedure documented in Tesla's official Model 3 service manual.

What you need

  • A Tesla with Service Mode access (Model 3, Model Y, Model S or Model X)
  • About 15 minutes and a flat parking spot
  • A clean rag (coolant can spit a little as bubbles escape)
  • Optional: a bottle of Tesla-spec coolant (G48-equivalent) to top up the reservoir if the level is low

No tools are required. This is a documented service action and does not affect your warranty.

Steps

  1. Enter Service Mode. Tap the car icon, then Service. Press and hold on your model name (e.g. "Model 3 Long Range"), then enter the Service Mode password when prompted.
  2. Open Coolant System. In Service Mode, tap Thermal → Coolant System. Note the starting Autopilot ECU temperature shown on the right — you will want to compare it afterwards.
  3. Arm Coolant Purge. Tap Coolant Purge → Run. Keep the car in Park. When prompted, press and hold the brake pedal together with the right turn signal to unlock the routine. Shifting into Drive cancels it.
  4. Remove the reservoir cap. Open the frunk, lift off the upper trim panel, then the HVAC intake cover. Slowly unscrew the coolant expansion-tank cap — keep the rag handy.
  5. Start the purge. Confirm start on the touchscreen. The coolant pump will run at maximum in a pulsing pattern (roughly 3,500–6,500 RPM) for about 10 minutes. Hissing, bubbling and pump whine are all expected.
  6. Monitor and top up. Keep the fluid level between the NOM and MAX marks on the reservoir. If it drops below NOM during the cycle, add Tesla-spec coolant.
  7. Close up. When the countdown reaches zero, refit the cap tightly, replace the HVAC cover and upper trim panel, and exit Service Mode.

Tips

  • Re-check after a hot drive. After 20 minutes of warm-weather driving, revisit Thermal → Coolant System and note the Autopilot ECU temperature. Anything consistently above ~65°C suggests residual air — re-run the purge.
  • Fix leaks before you bleed. If the reservoir sat visibly below NOM, find and fix the leak first. Bleeding a genuinely low system just draws more air in.
  • Watch for pump lock. If the pump speed sticks at 7,000 RPM during the routine, the pump is air-locked. Abort, top up the reservoir, and restart the procedure.
  • Make it annual. Out-of-warranty autopilot-computer replacement is expensive — the video's creator cites Czech-market prices of around 52,000 CZK for Intel-based units and above 80,000 CZK for AMD-based units. A 15-minute yearly bleed is cheap insurance.

For European owners

  • EU Teslas use a G48-equivalent glycol coolant — do not top up with North American HOAT-type coolant.
  • EU service centres are inconsistent about bleeding after a coolant top-up. If your car came back from a cooling-system service recently, run this procedure yourself on day one.