Prior owner(s) had green coolant, so I have a leaky heater core, and athsma to boot, so the glycol vapors leave me a little short on wind. Demon additives (bars leaks) probably do more for my pariah cred than my leakage, though it is not as bad as it used to be.

I've been looking at Evans NPG+ as a non-toxic, non-pressurized coolant (1 atm boiling point 375F). My thinking is it's a better fix than a used heater core ($100 + dashectomy) or a new one ($300 + dashectomy).

My thinking is no pressure-> less leakage, food grade propylene glycol -> what leakage there is is not nasty.

Any ideas?