Q: fan noise even after resetting SMC

An apple article is there you can follow it  :Mac notebooks: Spotlight indexing may make the fans run - Apple Support

Go to system preferences > energy saver > open the padlock by entering user name and password > power adapter > disable wake for wi fi net work access .

• With Wake on Demand enabled  and your Mac in sleep mode, your Mac will occasionally wake for a brief time, without lighting the screen, in order to maintain active shared service registrations with the Bonjour Sleep Proxy. On some Macs, sounds from the optical drive, hard drive, or fans may be heard during these brief periods.

Run an Apple Hardware Test:

https://support.apple.com/en-us/HT201257

Note that an error free AHT is not conclusive.

Ciao.