What is the purpose of the Carb heat

[Allison Riccardi]

How detrimental to different phases of flight is it? What exactly does it do? How can I be sure that it is working effectively? What is the purpose of it? Any other information I should know about this thing? Thanks for the input.

 

[PeterNSteinmetz]

It is important to know that carb icing can happen in temperatures well above freezing.

View attachment 57729

Can you post a source for that graph please? Thanks.