I started my car and drove around and was flooring it too for about 8min and the temperature was still cold, it didn't even move. My fan was off too. I know the thermostat could be stuck open but after about 12min the temperature needle went up a little bit. The farthest I've seen it up was 1/4 when 2/4 being half. What could go wrong if I keep driving like this without fixing it? Heard that the oil needs to be warmed up to have the engine run properly.