Another thing you can try is a spoiler under the front bumper or under the radiator. This causes a low pressure area so the hot exhaust from the radiator has a place to go.

I had an 89 T-Bird Super Coupe and hit a tire tread on the highway one time, it ripped off the spoiler however I stopped and picked it up (luckily). But untill I re-installed it, the car would run much hotter.

I ripped the spoiler off my Dodge diesel truck last winter on a snow drift on the highway and the same thing happened. So these spoilers are good for something besides looks.