AI Box Overheating Shutdowns: Heatsink, Cooler or Fan?

1. Take the box out of any closed compartment if you can.
2. Find the heat-spreader side: the metal disc on the back of a TBox Ultra, or the back wall on other boxes.
3. Clean that surface, then fix an aluminium heatsink to it with thermal adhesive or the thermal pad that came with it.
4. Or clamp a magnetic (Peltier) phone cooler to the same spot and power it from a separate USB socket.
5. Drive your usual route and compare the temperature reading with before.

The community FAQ gives this as the standard advice for a box that runs hot: buy a heatsink and stick it to the back. Owners of TBox Ultra boxes with a magnetic cooler running reported temperatures under 35 °C. One Ultra 3 owner glued a passive 90 mm computer CPU cooler to the base with thermal adhesive, removed its fan, and found the passive cooler sufficient.

Fit matters. One owner with an Ultra 2 fan shroud found the heatsink is not square, so it must be oriented so the box still slides into the shroud with its power cable facing the slot. Try the fit before the adhesive sets. An Ultra 1 owner dropped from 60–70 °C to 35–40 °C by wiring a fan directly to the board; that voids the warranty and is not recommended.

1. Turn on the temperature display so you can see the effect.
2. Fit a small USB fan blowing across the back of the box, or a magnetic phone cooler clamped to it.
3. Power the fan or cooler from a separate USB socket, not from the box’s own port.
4. Drive your usual route and app combination and check the reading again.

One Ambient owner running navigation and Spotify in split screen saw the box heat up within one to two minutes and reboot at roughly 75 °C. A heatsink only made it take a little longer; a fan fixed it. A second Ambient owner found that stutter, crackling sound and reboots stopped after fitting a fan, and a third traced stuttering to a box too hot to touch and cured it with a cooler.

For scale: another Ambient owner pushed the box to 91 °C with a benchmark app, and a Peltier cooler brought the same test down to 53 °C. In normal navigation and music use that owner’s uncooled Ambient stayed at 50–60 °C in warm weather, so how hard your box works matters as much as the cooler. A fan is audible in a quiet cabin; put it where the noise does not bother you.

1. Attach a magnetic phone cooler, with the metal plate it ships with, to the flat face of the Picasou 3.
2. Power the cooler from a separate USB socket.
3. Switch off the cooler’s RGB lighting if it has a switch.
4. Drive your usual route with the SIM in and watch whether data drops or reboots return.

On the Picasou 3 the first sign of heat is often lost mobile data, then lag, then a restart. One owner had data drop when the box was hot, came back if the SIM was nudged, and stopped completely once a cooler was fitted. Another has used a Peltier cooler on the outside for six months, with the SIM in, and has had no overheating since.

The cooler has to sit flat. One owner drilled extra holes in the case and found it only somewhat better, which also voids the warranty. The Picasou 3 Pro guide covers the P3 and P3 Pro in more detail, including the hidden CPU monitor.

1. Mount the box on a vent holder (magnetic or clip) in front of a dashboard air vent.
2. Route the cable downward so the holder stays put.
3. Keep that vent open with the fan running on long drives.
4. If it still shuts down at moderate temperatures, test the Y-cable power fix.

A TBox Ultra 2 owner whose box kept shutting down while lying on the console, even with a heatsink and trimmed background services, moved it onto the vent airflow and reported it now runs for as long as the drive lasts. A 40 mm heatsink alone had helped only a little. Another owner ran a box on a vent all winter with one reboot in that time.

Placement alone makes a large difference: a TBox Ultra 3 owner reported the box stayed cold hanging cable-down on a vent, while lying on the console its back was too hot to hold. If the vent blows heat in winter, choose a vent you can close, or use the cooler fixes instead.