Yes, V6 TB coolant is for Anti-icing but icing carb/tb/tbi isn't just about freezing weather.
Icing can happen even in warm to hot weather because air gets cold in some spots moving into an engine.
Air at higher temp will handle more humidity then cold air and why "Relative Humidity" reported by weather people are calculated w/ air temp. IOW High RH at 70°F and air gets cold somewhere going into the engine that spot can puddle or freeze the water in the air there. Icing is often in the TB etc but not always. Can be right next to it or anywhere.
Icing can make very annoying problems to kill the engine but as fast as you can check the TB etc will melt the ice and often dry out before you see anything.
Many TBI and Carbs have Thermac subsystem to heat the air before air goes thru them for same reason. 86 and older Dukes have this.
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Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)
The Ogre's Fiero Cave