My water temp gage is acting up. The peak says it's 120 but when it hits 100 the little red light starts to come on..... The weird thing is when I'm pushing the gas it's not lit, but once the car starts to slow down or come to a stop the red light lights up again. What do you guys think it could be? Do you think it's leaking cause I keep adding fluid to it but still red light. I would appreciate your help.