FAN running excessively since Catalina install
The fan is running much too often at high speed since I installed Catalina.
how is this corrected or is it an issue with Catalina?
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It's an issue with the computer caused by other software you have installed and running.
A Troubleshooting Procedure that may Fix Problems with macOS El Capitan or Later
You should try each, one at a time, then test to see if the problem is fixed before going on to the next.
Be sure to backup your files before proceeding if possible.
- Shutdown the computer, wait 30 seconds, restart the computer.
- Disconnect all third-party peripherals.
- Resetting your Mac's PRAM and NVRAM
- Reset the System Management Controller (SMC)
- Reset your Startup Disk and Sound preferences, if needed.
- Start the computer in Safe Mode. Test in safe mode to see if the problem persists, then restart normally.
- Repair the disk by booting from the Recovery HD. Immediately after the chime hold down the Command and R keys until the Utility Menu appears. Choose Disk Utility and click on the Continue button. Select the indented (usually, Macintosh HD) volume entry from the side list. Click on the First Aid button in the toolbar. Wait for the Done button to appear. Quit Disk Utility and return to the Utility Menu. Restart the computer from the Apple Menu.
- Create a New User Account Open Users & Groups preferences. Click on the lock icon and enter your Admin password when prompted. On the left under Current User click on the Add [+] button under Login Options. Setup a new Admin user account. Upon completion log out of your current account then log into the new account. If your problems cease, then consider switching to the new account and transferring your files to it - Transferring files from one User Account to another.