If you boil wine it will be mulled wine what people make at Christmas.
I agree with Dark Star If you add Campden tablets or sodium Metabisufite Powder that will stun the yeast even if you add A bunch like I have before it to sterilize it(Alot of sufites) didn't Kill the yeast just stuned it until degased for a "LONG TIME."
I do read this alot with people having success, but first let me explain people will read this, and that on web pages, and assume that is how it is I read This from accual people, but it still doesn't mean the same results will happen.
Let me tell you this first from the scientific view when adding Potassuim sorbate your not Killing the yeast at all, but your sterilizing them so they wont produce, when you add sorbate alone to a "acctive"wine it won't have much of a effect.
This is what the other(very) experienced (person) says"
If you add campden or powdered sulfites before you add potassuim sorbate, but not right before, because(the dissolved in warm water)sufites that stun the yeast first need time to work before sterilizing them you can add to a wine while it has rediducial sugar.
The cold might be another way I would think, because it makes them go dormant.
Remember what you read isn't always correct.