No the fan will run automatically when the temp reaches 80°c as set by the kernel developers.
You can install cpu-temp-speed to check the current temperature.
Vim3 doesn’t really get hot as compared to other soc’s if you have the official heatsink to it is enough for the device to run under heavy load, fan cooling is just a bonus.
If you want you can reduce the tripping temperature for the fan to start.
Full discussion about fan in mainline kernel can be found here.