I start it up and it drove fine and about halfway to school I looked at my tempature gauge and it was point at the sky...about were the 215-250 would be. So I made it to school and I was watching it the whole way and it would flicker down a little when it revved it but wouldn't come down at all. I just replaced the thermostat so that should be good unless I just fried it or got a bad one. My air dam looks like its in good shape and all the hoses and fluid level cheched out in my two minute look over.
Whats the deal?

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speed is a good thing,
more speed is a better thing

 

if its at 215 (probably a typo) then its pretty normal
if tis at 245-250 then...
did you get all the air out after you changed the t-stat?