Lots of good advice above (other than the original poster)
Just to add some comments.
It's important to understand or at least accept the differnce beween ice forming in engines or naceles where pressure reductions at low fan power reduce the apparant temperature and allow ice to initiate much sooner than windscreens.
Also for the most part engine anti-ice typically refers to the inlet since very few engine now-a-days bleed the warm air into the engine itself, preferring instead to use the effects of windage or centifugals off the spinning blades.
And to be technically strict, many points in the certified icing envelop will still generate ice on engine and inlet related surfaces so the so-called anti-ice simply limits the amount of build up (before shedding to something that won't be noticed in the flight deck or otherwise damage the engine.