Oh I didn't have any specific cooling liquid so I am using distilled water at the moment?
You will have problems due to the mix of copper and aluminium in the loop. I have no idea over what timescale it will become a problem, but it would be advisable to add an additive or swap out to dedicated coolant which won't have the same problem.
So the provided cooling radiator is copper? That's a surprise.
Because water carries 50% more heat than ethylene glycol, the basic ingredient in most antifreeze coolant, I want to use distilled water (~.68 cents/gallon in Walmart) and perhaps rig up a PVC water filter with the guts from a quality water filter advertising removal of metal ions.
Beta-amyloid, the stuff implicated in causing Alzheimers Disease, is linked to two copper and a zinc molecule(s). So, with copper piping in most homes built last century, many are struggling to get the copper out of their water. Copper removing filters are available.