I have a problem with my 97 Sentra overheating. I'm unsure if it's a blown gasket, although I have used liquid copper and that has not fixed the issue. My car keeps overheating... and blowing hoses. I fix the steaming hoses and then it overheats every 20-25 miles instead of every 3-4 miles. Then, after a while, I'll blow another hose and the reservoir is bubbling and you can hear hissing noises coming off the hoses. Could this be gas from the engine or pressure from the thermostat? Does the liquid copper really work? I almost bought a more expensive type of gasket leak repair, "Blue Devil, but it was 50 bucks as opposed to 10 and someone I know recommended the liquid copper. Could really use some help here.