Re: how much anti-freeze ?
I use 100% antifreeze mixed 1 to 1 with distilled water in all my toys. Then you are certain that you have the purity, and there is no need to test anything.
It is always a good idea to periodically replace your coolant anyway, even in a modern vehicle it picks up contaminants within the system.
I would drain the whole system, and replace it with new 50/50 coolant. That will give you all the protection you need for all extremes, and no need for heat lamps and such.
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