Honda Civic Coupe 2003 Overheats on idle. What would be the cause?

I just bought a Honda Civic Coupe 2003 on Monday and been driving it to make sure its good (used car, dealer) It was going a bit passed half way which is normal but I drove it yesterday and was stopped on a red light a while and it went all the way up to the red line.
After that I U-turned back to my parking lot structure at my office and drove in and out to get flow going. It then went back down half way then 1 line less than half way. I kept driving down the street and would not heat back up unless I idled too long.
I stopped ate at an In N Out and drove home and didnt heat back up again since it cooled down.
I am took a picture and will take it to dealer today but want to see if anyone has an answer to what it could be so when I show him the pic I can let him know what he might want to check so they can fix it. I have 30 day warranty or 1000 miles.

Please help will be going in about 4 hours. Thanks everyone!
Added (1). More info on car:
81,000 Miles (zeros are some numbers)
Tried with AC on and off both went little over half way.
Added (2). I will be closing this issue in 4 hours. Any more answer with more info or advices is much appreciated.
Thanks everyone!
Added (3). Thank you for all the advice on my question, Heading to dealer now and have this fixed. Thanks everyone!

Read more: Honda Civic Coupe 2003 Overheats on idle. What would be the cause?