I've been asked how to make the Enermax Liqtech TR4 II stable, as it has a bad reputation on the internet. Many of these pumps have failed due to internal corrosion thought to be due to poor or non-existent anti-corrosion solution.
Before using, I 'repaired' the cooler: first, by flushing out the radiator and pump housing, next by re-filling with a good quality, anti-corrosion solution, and finally, by re-surfacing the plate.
I used these two videos as a start for the tear-down (the pump method is cleaner; I did the work in my kitchen sink):
https://www.youtube.com/watch?v=luUwpbdYnaQ
https://www.youtube.com/watch?v=Hx-fhoB5Gyo
I used this pump to flush the radiator several times with water before re-filling:
https://www.amazon.com/gp/product/B07GR1HSR7/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
I used this solution (it's a concentrate; follow directions on bottle to dilute with water) to re-fill the radiator/pump:
https://www.amazon.com/gp/product/B00CDXQ22M/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
I then re-surfaced the plate, as I already posted in this thread here, to make the surface flat to better transfer heat from the CPU.
After the above steps, the pump works great with good thermals and it is very quiet. More importantly, after these 'repairs', the functionality and longevity should be much improved. BTW, the fans that come with the pump are actually very good and I did not replace with Noctua fans as originally planned.
When setting pump speed in BIOS, you want to set the speed at a minimum of 2500 rpm (less than 2000, the pump won't work and the LEDs won't turn on: the LEDs are a good indicator that the pump is working). I think it's now running closer to 3000 rpm. If running at full speed (>4000 rpm), it is too fast and I think will shorten life-span of the pump. I mainly use fan speeds to vary cooling and keep sound at minimum when thermals are low.