Fan constantly running even when CPU and RAM usage low

Hi chenzhong1, 

Greetings!

Thank you for posting in Microsoft Community.

I'm sorry to hear about the Fan noise on your Surface device. I appreciate the effort in running couple of updates on the device.

May I ask for clear screenshots on your Task Manager > under Performance Tab?

Even with less RAM and CPU usage, the CPU or device still needs assistance in terms of cooling process to give a good performance output. The core temp of your device might be stable because the Fan are constantly giving enough spins to maintain a good temperature and with good temperature this means better performance.

You can also adjust on how you want your CPU to perform, by selecting the battery icon on the task bar and adjusting the power mode. Setting the power mode to Recommended throttles the CPU and helps keep it running cooler with less need of assisted cooling. While a setting of Better performance or Best performance will allow the device to run more quickly, it will also allow the fan to come on more often to keep the CPU cool and performing it's best.

Try to also perform the methods below:

• Force the device to restart. Press the power button for 20 seconds while the device is turned on.
• Run the Surface Diagnostic Toolkit.
• Run the System File Checker.
• Install the drivers package manually.
• Check the specific OS build of your Windows Settings> System> About.
• Download the driver and firmware for Surface, choose Surface Laptop 4 and click download on the next page.
• Please choose the .msi file that matches your current OS Build and click Next.
• After the download, runand installthe .msi then Restart the Surface Device

Hi chenzhong1,  We have not heard anything from you in the last 72 hours. Please do not hesitate to create a new thread if you have new concerns. We hope that the issue you reported to us has been resolved. We personally understand that finding time to work on this matter can be a little difficult to manage.  Thus, we would like to let you know how much we appreciate your patience and most importantly the time you've dedicated to getting a resolution for this issue of yours.

Hi chenzhong1,  We have noticed that you have not responded to our last message. We would like to know whether the issue you have raised with us is still ongoing? If yes, please let us know so that we can continue our conversation.