Rather that using a antifreeze I would hook it up to compressed air and turn it on. You will know it blow out the water when you hear air blowing through it. To be on the safe side I would fill the air tank to a max pressure of 60 psi or set the regulator on your compressor which is the normal high pressure of a well since they might have used plastic lines in it. If you use RV antifreeze it will take a while to get the taste out of the ice maker and you will need to pump it through it.
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