I am driving my car and I see more water in my.

I am driving my car and I see more water in my over flow it go's to the top an I replaced the thermostat yesterday cause it was stuck I put my hand on the motor it didnt feel like it was over heated could my radiator be going bad or is my head gasket blown I do not see any signs of a blown head gasket yet are these warning signs its about to blow is my engine in fact over heating on the way home I noticed my cooling temperature gauge go up past half way for a couple seconds at a red light then I proceeded home it went back down half way an the car was smoking it was at night time so I think the cool air something to do with why I didnt over heat an car blow up please help me I will give you my best recollection the past three weeks in fact its been boiling coolaint going up to the of the over flow I just changed out the thermostat to see if it would stop but it has not I am out of answer an luck please help me find out what it is I just hope that its my radiator thats going bad the clutch fan does turn on its a 5 speed Manuel transmission I do see the radiator fan come on and it still gets really hot around the radiator