Robert, like Vaughn, I don't see a reason not to go for it. but keep in mind, that used antifreeze is going to be laiden with rust. It's coming out of old cars. Could have some oil in it also. The rust inhibitors in antifreeze break down over time, and that's why it gets dark (dirty) when it's 3 or more years old in your car. This rust could clog up your "radiator", and could deteriorate the inside of the chest freezer, if I understand correctly that you will be using it as a tank for the antifreeze. At a minimmum, it needs to be filtered well. And you need to find out what problems, if any, it will have on the material inside the freezer. You would be best to have radiators inside the freezer for the antifreeze to run through to collect the cold, where the antifreeze is, and let the pump circulate the fluid. That way the andifreeze never comes in contact with the freezer unless there is a leak. Most freezers get the cold air from the condensor of the cooling system by air, and therefore are not water tight. Another way to do this is to use lots of copper pipe in the freezer for the fluid to run through. But that's expensive also. Also keep in mind that the freezer puts out some heat during it's heat exchange.
Keep playing with this idea. Just be careful with the fluid, you don't want to have it all over the floor in the shop, nor a leak outside that animals could get into. Jim.
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