Glycol fermentation chamber

I already have a fermentation chamber duel level with duel controls. I’m tired of changing ice and want a better way. I was thinking of doing a propylene glycol heat exchanger. I picked up a bottle of automotive fluid and the only thing they add is a anti corrosion additive. I was going to use a fountain pump, small transmission cooler, and the same fans I got now. I was going to keep the thermostats I got now and use a solid state relay to trigger the pump. I wanted to know if anyone has done this yet, or as any tips or trick they could pass this way. Thanks in advance.

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