Macbook Pro fan won't quit

[PapaPiccolino]

Hi all. I have a MacBook Pro 17 inch, late 2011, running High Sierra. I've owned this computer for several years. I pulled it out of its box today, after not using it for several months. As soon as it starts up, the fan is running at full speed, and it keeps running at full speed for my whole session. I only use it for light internet browsing. In all my years of owning this laptop, I have never experienced this. I have tried zapping PRAM, resetting SMC, logging out and back in, running Onyx, adjusting energy saver prefs, but nothing helps.

If anyone has any ideas on how to solve this, I would really appreciate it.

 

[wilberforce]

Could be a faulty temperature sensor.
Install MacsFanControl or Stats or similar, and see what the various temperature sensors say.

Check Activity Monitor CPU usage for "All Processes" and see if kernel_task is taking all the CPU (which indicates a temperature monitoring problem)

You could open it and clean out the dust, but if the fan immediately goes full speed this probably is not the problem.

I don't know this model, but perhaps thermal paste needs renewing?

Also do this:

Use Apple Diagnostics to test your Mac - Apple Support

Apple Diagnostics, formerly known as Apple Hardware Test, can check your Mac for hardware issues.

support.apple.com

 

[appltech]

I noticed that macOS sometimes does some background stuff after not being online for a while. Check your Activity Monitor for usage

 

[Moonloop]

I too have the constant fan running and noise on MacBook Pro 2018 running Ventura latest Public Beta . What's worse is if I close the lid to 'Sleep' , the fan keeps going ! I reported it 2 betas ago but no change since

M