In Illinois if I go to the dmv to get an id snd I have a will I get arrested?

If it's an IL warrant, yes, very possibly - minimally you will be turned away.

I tried to research this question online and maybe you have too.
I found many opinions on your specific question but no two answers were the same. Most frequent suggestion was to call or have someone call for you to find out what the official policy is. My feeling is that considering the new laws and procedures that have been fairly recently put into effect in the U.S.- there is a good chance that the warrant would be discovered. Whether motor vehicle dept. agents are required to do any follow up, if and when a warrant is discovered, I cannot ascertain. If the warrant involved motor vehicle law violation in Illinois, the chance of action by the motor vehicle dept. is greater most likely.

Why not merely take care of the warrant, but yes, in most cases they will notify police who will show up. Plus of course this will supply a new and correct address for them to just come get you, if they do not detain at DMV

"Most frequent suggestion was to call or have someone call for you to find out what the official policy is."

Just out of curiosity, where did you read this? In NY (where I am and I can't believe it differs) you can't call DMV or have someone else call and say "I have a warrant, if I come in will I be arrested?" and get an answer. Without knowing where the warrant was issued, why, there is no possibility of answering. Of course they'll say no with the hope that you'll come in - and then they've got you, as FrChuck said, or else they have your new address.

In my state, you can't call the DMV period.

Have to laugh, Joy - DMV computers were down in total for (I think) 3 days. You can call. They just won't answer.

Judy,

Here for one:
Outstanding Warrants And I Need An I.D. In Illinois
And some Q/A sites similar to AMHD.

And PennDOT still answers the phone believe it or not. Can't say for Illinois, couldn't find their site.

That answer is from 2008, before the States went nationwide with the computer system.

I can't believe an open warrant won't "caught," but I've been wrong before.

No ID might be the price OP has to pay.