So I was driving on the freeway today and see my temp needle almost at hot (75% of the way). So I pull over open the hood, and all this smoke is comming out. So I check and I see all this smoke is comming under the intake area but there are soo many coolant lines I dont know which one it is! What test can I do to find out where the leak is comming from.

There was still water in the reserve tank, thermostat changed 6 months ago.... if that helps at all...

thanks.