If this is your first time filling a Hydro X series custom cooling loop, we have a video on how to make sure your first filling goes smoothly.

Video instructions

Before filling your cooling loop

Before filling your cooling loop, here are some things you should do:

• Make sure your system is powered off, since you will be checking for leaks during the filling process.
• Use a fill bottle or a funnel for pouring coolant into your cooling system to prevent spills.
• Have a 24-pin jumper ready so you can power on your power supply unit (PSU) without using your motherboard.
• If you have an external PSU, you can use it during the filling process if you find using the PSU in your PC system inconvenient.

Filling your cooling loop

To fill your cooling loop:

1. Fill the cooling loop reservoir with coolant until the reservoir is nearly full.
2. Turn on your PSU and let the coolant flow through the tubes.
   • Keep an eye out for any leaks in the cooling system.
3. Turn off the PSU before the cooling reservoir is completely drained.
4. Refill the reservoir with coolant.
5. Repeat steps 1 to 4 until the coolant in the reservoir no longer drains when you turn on the PSU.

After filling up your cooling loop, we recommend letting the cooling loop run for a few hours with the fill port open to vent as many air bubbles as possible. This will help improve the longevity of your cooling system. You should also take this time to double-check for any leaks so you can make adjustments.

Once you are satisfied that your cooling loops is running properly, turn on your PC. We recommend stress-testing your PC to ensure that your cooling system does not get too hot; overheating cooling systems are prone to leaks, which can damage your system.

When to replace coolant

Typically, you want to replace the coolant in your cooling system every 12 months or so. If you want to be safe, change the coolant every 6 months.

If you are using opaque or dyed coolant, you will need to replace your coolant much more often to avoid buildups in your cooling system. If you do not want to frequently replace coolant, we recommend staying away from opaque or dyed coolant.