Honestly liquid cooling is not necessary if you dont overclock. Fans last longer and liquid is only about 10 to 20 or so degrees cooler.

Observe the fans on your liquid cooler, listen closely to the pump if possible. What brand is it?

Also look at the graphics card fans and watch if they struggle to spin.

Check your temps in hwmonitor. Seriously i have a feeling you didnt and just played games. You can stress test with software like prime95 for cpu or furmark for gpu