The W1700K has a USB port. Plug in a fan or any 40mm USB fan. Point it to blow into the bottom vents. This drops temps from 80°C to 55°C instantly.
Install cpufreq tools:
Here’s a concise piece of technical documentation / troubleshooting note based on your keywords (likely referring to the Xiaomi Mi Router W1700K — also known as the AX3000 or similar Mediatec Filogic 820 platform — overheating under OpenWrt). w1700k openwrt hot
If your W1700K hits 95°C within 5 minutes of booting with no traffic, you may have a hardware defect. Common issues: The W1700K has a USB port