Well glycol mixtures have an effect on flow and heat transfer, I would highly recommend you just hire a local company with chiller experince to give you full sytem evaluation then post back. We need glycol type prop. or ethy. actual gpm and design gpm, gpm of pump, need to use refractometer to check glycol % etc...... It is not rocket science but we are just guessing with what little info is given, just like your off road suspension it is very complex with engineering but the actual building of it can be done by anyone who can read a print and weld and fab.