Version 2.103 landed with a handful of fixes that matter for real-world use. Auto Boost rules no longer trip over themselves when you plug in or unplug the power adapter. Fan control and speed readings come back cleanly after Siri or voice dictation finishes. And if you’re on an M4, M4 Pro, or M4 Max machine, you get complete fan control now — not partial, not “coming soon.”
Custom fan rules that actually listen
Pre-built presets are fine for a quick check, but the real power is in hooking fan behavior to any temperature sensor the Mac reports. You pick a sensor, set a floor and ceiling, and TG Pro ramps the fans on a curve you define. That means you can tie cooling to the CPU die, the GPU, or even the SSD controller — whatever runs hottest in your workflow. The rules live in the background and sip CPU time, so they don’t become the thing they’re trying to fix.
Diagnostics and the Hackintosh toggle
TG Pro ships with a diagnostic run that logs every sensor and fan channel over a timed window — useful when a machine passes Apple’s hardware test but still thermal-throttles under real load. A single preference switch opens up full support for Hackintosh builds, where motherboard sensor layouts don’t follow Apple’s playbook. Between the diagnostics and the manual sensor-to-fan mapping, you can chase down cooling problems that the standard tools won’t even see.
One power adapter, two fan personalities
The Auto Boost fix in 2.103 solves a quiet annoyance I saw in the last build. You’d set a rule that said “fan speed goes to 4200 RPM when the CPU hits 82 °C,” and it worked fine on battery. Plug the charger in, and the rule would sometimes ignore the temperature spike. Now the rules track the power source change and react the same way on either side of the MagSafe connector. For anyone who edits video or runs compiles from a coffee shop table, that’s one less thing to babysit.
When Siri gets out of the way
MacOS takes over the fan controller during a voice dictation session — it’s an Apple thing, not a TG Pro bug. The problem in earlier versions was that TG Pro didn’t always reclaim control when dictation ended. You’d finish a long email, the fans would sit at the system default, and your custom curve stayed on the bench. The 2.103 update restores your fan settings the moment Siri stops listening, no manual nudge required.
Scene: a refurbisher’s bench
Imagine someone who buys used MacBook Pros, cleans them up, and resells them locally. They get a 2019 16-inch unit that looks perfect but runs the fans at full tilt the second you open Safari. Apple Diagnostics says everything is clean. TG Pro tells a different story: the GPU proximity sensor reads 68 °C at idle, and the left fan is stuck reporting zero RPM. A quick diagnostic log confirms the fan channel is dead, not the sensor, and the machine goes back to the seller before money changes hands. Five minutes with the free diagnostic run saves an afternoon of guesswork and a return shipping label.
Mistakes that new users make
TG Pro hands you a set of keys to the cooling system, and it’s easy to turn the wrong one first. The most common stumble is setting both fans to a flat, low RPM and walking away — the CPU hits its thermal ceiling silently, and performance drops off a cliff. Another is binding a fan curve to a sensor that barely moves, like the Wi‑Fi module, then wondering why the machine still throttles under CPU load. And plenty of people install it, open the menu bar display, and never visit the rules pane at all — which means they’re monitoring the problem they could be solving.
- macOS 10.13 or newer
- Intel 64-bit Mac
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