It started to over heat while driving, I took the thermostat out and run it for half hour and it was great, then just now driving to work I notice its starting to run hot again, (no thermostat) get to work an it's just pissing out smoke and steam from the exhaust, It won't start at all now , the water was flowing great last night, so I don't think there will be a blockage? , can someone give me an explanation that's not worst case scenario . I'm honoring I haven't damaged the head or gasket , I wasent driving it hard either