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It may run hot but it will not circulate that coolant thru the heater core. I had Chevrolet trucks back in the 60's and that was always the issue. Low coolant, No heat.

Well that will do it. Low coolant and a hole in the cooling system will prevent the heater from working at optimum efficiency. That is a pressurized cooling system and must be full and pressurized to operate as designed. Every GM I ever owned had little or no heat when the coolant was low. Good...

I drove a CUCV for over 20 years as a daily driver. Fact is several CUCV's over the years. Many I had were bare bones. I even removed the jute padding from inside on the firewall and had a bare painted floor or Line X. I had aluminum heater cores in a few and brass / copper ones in a few others...