why is the fan always running on my Mac book pro. I bought it 2 years ago and it didn'trun the fan continuously. Is there maintenance that needs to be done?

Your fan always runs. It's just that you don't always hear it unless it runs at a higher speed. That is running is a good thing. It also depends on the software installed and whats running. for instance, if you have Google Chrome. and are watching streaming videos. That can cause your fan to rev up.About fans and fan noise in your Apple product - Apple Support

..mary jean:

Perhaps the MacBook Pro has something not officially sanctioned such as antivirus

or other 'utility' that has habit of running or scanning in the macOS; and taxing the

system, freely and unnecessarily using system resources? Third-party cleanup tools?

You may see something amiss in the Mac by using Activity Monitor; which can be

used to temporarily stop those run-amok processes; or force-quit them, in there.

• View energy consumption in Activity Monitor on a Mac - Apple Support

https://support.apple.com/guide/activity-monitor/view-energy-consumption-actmntr43697/10.14/mac/11.0

A better article is more all-inclusive to look deeper into the Mac.

• Activity Monitor User Guide (Table of Contents) for Mac - Apple Support

https://support.apple.com/guide/activity-monitor/toc

Some suggestions may include use of free EtreCheck utility, which

most users of long acquaintance in ASC have and use on occasion.

Innovated by a Mac user, who decided some time ago to share it.

• EtreCheck Pro (choose default 'free' version & read "How to Use" user-tip)

https://etrecheck.com/

• How to use the Add Text Feature when Posting Large Amounts of Text, i.e. an EtreCheck report - Apple Community

https://discussions.apple.com/docs/DOC-250000211

Another idea may be to occasionally run a useful 'anti-malware

tool for Mac'. Also innovated by a mac user participant in ASC.

Thomas R still contributes to this community.

• Malwarebytes for Mac (download link) read first: works beyond 'free-trial'.

https://www.malwarebytes.com/mac-download

(manual adware, malware, etc removal methods are on separate website by T.Reed)