I have used Perma Cool fans on my Mustang (high performance fans #19114) for 5 years with no problems. Also used the same fans on my 1975 Dodge truck for almost 8 years with no problems. Yes if they run constantly any electric fan, even factory will burn out. Also I never use any mixture other than WaterWetter by Red Line and the rest distilled water. I live in southern California and do not have overheating issues in bumper to bumper traffic.