It’s not easy and it’s a good idea to research how heat flows in your Mac model before you proceed. With multiple fans, it is also possible that a single fan doesn’t have access to all the sensors on your Mac in which case you’ll have to keep an eye on multiple sensors and the temperature of multiple regions. If you have more than one fan though, it means cooling is divided between them and you will have to look at several different regions within the chassis of the Mac to manage the heat effectively. If you have a single fan on your Mac, it might be fairly simple to manage it since you know it’s the only thing that will be keeping it cool. Tap the Power button to turn the MacBook on, and your fans should be back to normal.Release the buttons and wait 5 seconds.Hold down the Left Shift key + Control + Option + Power button all at once for 15 seconds.If it isn’t connected, connect it first before moving to the next step. To fix it, you have to perform an SMC reset or a System Management Controller reset. If your fans are suddenly running when they shouldn’t, running constantly, or not running at all, you’re going to have to fix it. Absolutely absurd.While this is generally safe, you can run into problems with the fan even if you aren’t changing how they work. Clearly, in this case, someone just shot a clump of compound onto these chips and smooshed the heatsink down. Typically on mass-produced parts, the thermal compound is pre-applied directly to the heat sinks in an automated fashion. AMAZING results! - Mac ForumsĮvery time I see those pictures, I am just DUMBFOUNDED that this could have been done in a factory setting. Re-applied the thermal paste on my MacBook Pro. The process isn't terribly difficult, but it would definitely void any warranty you have (assuming the tampering was detected). Anything else is just inhibiting efficient thermal transfer. There should be just a wafer-thin coating of thermal compound (enough to fill in the microscopic gaps between the heat sink and the chip) and no more. I haven't experienced any excessive heat issues with my two MBPs, but I would imagine that this is the cause of many of the issues I see here. Yep, it's well known that some of the MacBook Pros had an issue with WAY too much thermal compound applied to several heat generating chips.

Mac smc fan control