So I had a weird problem with my 95 5.0 recently. I was hammering on my stang and noticed smoke from the engine bay, pulled over and I had blown coolant out of my overflow tank. I also noticed that my upper rad hose is really stiff when the car is warm. I've replaced the thermostat but the hose is still stiff, but only when up to temp. I still don't know why I blew coolant out of the overflow.