MacBook Air Fan Won't Stop-Reset SMC

If resetting the SMC and actually replacing the fan doesn't solve the problem, your notebook may have other hardware issues that is causing the fan to run a full speed.

Some things you can try:

1. Boot up your Mac in Safe Mode.

   What: Use safe mode to isolate issues with your Mac- Apple Support

   How: At boot-up, hold down the <shift> key until the Apple logo appears on the screen.

2. Run either Apple Hardware Test (AHT) (pre-2013 Macs) or Apple Diagnostics (2013+ Macs) to uncover any hardware issues with your Mac.
   • How to use Apple Diagnostics on your Mac - Apple Support
   • Apple Diagnostics: Reference Codes - Apple Support
   • Use Apple Diagnostics or Apple Hardware Test- Apple Support
   • About the "Apple Hardware Test does not support this machine" message- Apple Support
   • How to Use Apple Hardware Test to Diagnose Mac Problems- OSXDaily
3. Run an EtreCheck report and post it here so that we can help diagnose any issue that we may uncover with your Mac.
   
   • You can download EtreCheck Pro fromhere or download it from the Apple App Store.
   • Start EtreCheck from a normal user account. Optionally, you can run it from a user account with Administrator privileges for additional details.
   • Select a problem from the drop-down menu to enable the "Start EtreCheck" button. Optionally, you can add comments on what issues your Mac is experiencing, especially to aide others with similar Mac issues.
   • Click on Start EtreCheck
   • Allow the program to run to completion.
   • When done, select Report from the left-side window to display it.
   • Select the "Share Report" icon.

     Select Copy Report

   • Paste the report to your reply post. (Note: The EtreCheck report does NOT contain any personal information.)
   • Ref:Using EtreCheck- ASC (etresoft)
4. Make a Genius Bar appointment at your local Apple Store.

   Check Your Service and Support Coverage- Apple Support

For getting the right support, here's a genius idea- Apple

To contactApple Supportdirectly.

You can only make 1-week ahead appointments either via the web link above or AppleCare phone support. The appointment timeframe is longer if you go in-person to an Apple Store.