My 1999 Acura TL overheats. I put water in it daily. The first time I noticed the overheating was after a hose blew off when my dad was driving it to work. He was pushing it at about 80 mph. Anyway, the temp needle will fluctuate while I am driving. It will go up when I am moving at speeds lower than 40-45 mph (3/4-in the red), but once I am going those speeds usually it will go down (just below 1/2). It mostly stays up when I haven't put water in it for a couple of days and the reserve is about halfway empty when i open it up. My dad says its a head gasket, but there are some forums that say its a sensor. My question is which one is it most likely to be?
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