I've been noticing that, for no reason, my CPU will get hit with a load, causing my fans to spin up. Happened to be looking at the task manager at the time, and found the source: Chrome Software Reporter, Google's scanner that scans your computer and reports back to Google, and is housed in %AppData%\Local\Google\Chrome\User Data\SwReporter\VERSION\software_reporter_tool.exe
https://www.ghacks.net/2018/01/20/how-to-block-the-chrome-software-reporter-tool-software_reporter_tool-exe/
Also, don't forget to disable Google's automatic update services, they check for updates literally every few minutes, sapping bandwidth, data, and resources.