I wouldn't rush hoe to deal with this, but I would drain the water out. You could probably get away with just a heat source under the engine cover, but it is simple enough to drain it down. Definitely no need to use the antifreeze. Pay attention to get the water out of shower or heater is you have either.
Two 14" 5 lug S5 wheels with ST205/75R14 Kenda Loadstar radials $349
Two 14" 5 lug S5 wheels with ST215/75R14 Kenda Loadstar radials $389
Two 15" 5 lug S5 wheels with ST205/75R15 Kenda Loadstar radials $409
Mounted, balanced and delivered.
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CARBURETOR REBUILDING - $199
Parts, labor and return shipping included
2 LED 6" BRAKE LIGHTS DELIVERED $32