How to fix an overheating Mac

The single most common cause of a hot Mac is one app or process working the chip hard, often with nothing obvious on screen. Open Activity Monitor from Applications, Utilities, click the CPU tab, and click the percentage column to sort by it. Whatever sits at the top, pinning a core for minutes at a time, is your heat source. Quit it and the temperature usually drops within a minute or two. The GPU tab does the same for graphics work.

Quit your own apps and tabs, not unfamiliar system processes. If you see something called kernel_task using a lot of CPU, leave it alone: that is macOS deliberately taking cycles to hold the heat down, a symptom of the problem rather than the cause, and it cannot be forced to quit. After an update it is also normal for Spotlight to reindex or Photos to analyze your library for a while, which loads the chip and then stops on its own. To watch the temperature itself as you do this, the guide on checking your Mac's temperature covers how, since macOS does not show it anywhere.

Heat has to physically leave the machine, so if it cannot get out, the Mac runs hot no matter what the chip is doing. The vents on a MacBook sit along the back edge near the hinge, and it pulls air in from underneath. A bed, a sofa cushion, or your lap blocks both, so the simplest real fix is to get it onto a hard, flat surface where air can move under and out the back.

The room matters too. Apple rates these machines to run in roughly 10 to 35°C ambient, and a warm room or a patch of direct sun gives the chip far less of a head start to dump heat into. If your Mac runs hot in summer and fine in winter, that is the ambient temperature talking, not a fault. Get it out of the sun and into cooler air, and on a laptop with fans a stand that lifts it for better airflow helps more than you would think.

Once the free wins are done, the last lever is the fans, and macOS does not hand it to you. By default it keeps the fans off or low until the Mac is already hot, then ramps them late and loud to catch up. That late ramp is exactly when the chip is closest to slowing itself down, and it is why a hot Mac so often gets noisy right when you least want it to.

ChillBlades adds that lever back. From the menu bar you can set each fan by hand with a slider across its real range, or turn on Auto Boost: pick a temperature band, Warm at 80°C, Hot at 90°C, or Very hot at 100°C, and a fan speed, and the fans spin up the moment your Mac reaches it, then ease off as it cools. Every setting is clamped to what the fan can safely do, so you cannot push it past spec or stop it dead, and the moment you quit, macOS takes back full control. Getting air moving early keeps the chip cooler and trades a sudden late roar for a steadier hum. The full walk-through is in controlling your Mac's fans. One catch: this only works on a Mac that has fans, so a fanless MacBook Air has nothing to take over.

Games and other heavy jobs push the CPU and GPU hard for a long stretch, so the Mac heats up and, as it nears its ceiling, slows itself down to cope, which is what thermal throttling is and why a long session can start smooth and then dip. The levers that genuinely help all come down to making the chip do less work per second. Cap the frame rate, with V-Sync or a 60 FPS limit, because an uncapped game renders as fast as it can and that is what maxes out the heat. Drop the resolution or render scale, and ease the heaviest effects like shadows and ambient occlusion. Where a game ships a native Apple Silicon build, use it rather than a translated one.

Alongside that, the same basics apply harder: close background tabs and downloads, keep the vents clear, and spin the fans up before you start rather than waiting for macOS to react. There is more on this in the guide to keeping your Mac cool while gaming.

If the heat keeps coming back, work through the slower fixes. Update macOS, since thermal and power-management fixes ship in updates and a known runaway-daemon bug is often cured by one. On an older Mac with fans, dust builds up in the vents and chokes airflow over time, so a clean helps. If you use compressed air, use short bursts, keep the can upright and the nozzle moving, and do not let the airstream spin the fans, which can drive them past their rated speed and damage them. A professional clean is the safer option. None of this applies to the fanless MacBook Air, which has no fans or fan vents to clear.

If you suspect a fan has actually failed rather than just working hard, test it with Apple Diagnostics: shut down, then start the Mac while holding the power button on Apple Silicon, or holding D on an Intel Mac, and follow the prompts. A cooling or fan fault shows up as a reference code beginning with PPF, which you can look up against Apple's list. Most of the time, though, the fan is fine and the heat is load or airflow, which the steps above fix.

A few popular fixes are useless or actively risky. Do not put the Mac in a fridge or freezer: the cold is not the danger, the condensation as it warms back up is, and it can cause liquid damage. Do not install a third-party cleaner or one-tap cool-down app, since no app cleans heat away and many of them are scareware. A real fan-control app changes fan speed, which is genuine hardware control, not magic cooling. And do not force-quit system processes hoping to cool the Mac, especially kernel_task, which is part of how macOS manages heat in the first place.

The biggest piece of outdated advice is resetting the SMC. That applies only to Intel Macs. Apple Silicon Macs, every M-series chip, have no SMC reset to perform: those functions live on the chip and reset on their own, so the right move is simply to shut down or restart. If a guide tells you to hold a key combination to reset the SMC on an M1, M2, M3, or M4, it was written for older hardware. A normal restart is the Apple Silicon equivalent, and it is already on the fast-fix list above.

I make ChillBlades, a Mac fan control app, so the fan section is the part I have a stake in, and I would rather say so up front. The rest is the honest fix list, with the dead ends called out. The operating-temperature range, the SMC difference between Apple Silicon and Intel, and the Apple Diagnostics steps are from Apple's own support pages (102336, 102605 and 102550). The temperature bands match the pillar on how hot is too hot for a Mac, which are practical figures rather than a published Apple spec. Your Mac protects itself regardless of what any app does, so treat all of this as guidance for keeping it faster and quieter, not as a rescue from danger.