dude.... i tell you what... if you do not know water cooling or refrigeration stay out and keep your words to yourself.
only on big systems do you need the extra pump to help with circulation.....
the compressor will do it just fine on a refrigeration circute
as in coolant leaking.... how is that going to kill you... you can drink it with horible stumack pains and loads of bowl movements but it will not kill you.
To the OP... dude.... it is going to be very costly.... i hope you do it to learn about refrigeration and how it works... it is a nice project to do phase change or chillers or what ever it is going to be....
advice or take note... what ever you do in that aspect be prepaird for the huge power bill and noise level... but expect lovely returns in temps and OCing
The OP asked for a machine to cool his coolant - that would be a water cooled chiller, which has separate water and refrigerant loops. You need a water pump for the water loop and a compressor for the refrigerant.
Refrigerant leaks are the danger not coolant (I admit that was a typo on my other post). If you have a leak in a coolant circuit you can instantly freeze anything exposed to the leak - which can result in severe tissue damage to anything exposed. I'm not talking getting a bit cold here - I'm talking actual burns to the flesh that is completely irreversable and often results in amputation. If you aren't aware of these risks you shouldn't go near a chiller circuit.
This is not a project to play with - chillers can be dangerous if you don't know what you're doing.