Answer by Englishangel. Confidence votes 12.5K. This is the sort of question you should ask the person who examines you. Medical professionals use a lot of lingo that the lay person doesn't understand and the doctor or midwife doesn't think twice about it so ask if you don't understand. a long cervix is quite normal.
The fan or fans should run when the coolant temperature in the radiator is above the temperature of the thermostat for your vehicle. Probably around 190 degrees. The answer should be in your operators manual as to what temperature a fan or fans should come on. Sometimes just one fan will operate if the water temperature dictates.
Electric radiator cooling fans usually switch on when the engine coolant reaches a set temperature. Automotive electric fans are also better in traffic because they can switch on if your engine gets hot. Engine mounted fans are less effective in traffic because they pull little air when the engine RPM is low. If engine to radiator clearance is a problem, some electric fans can be used as a pusher fan and placed on the grille side of the radiator. Pusher fans usually free up engine compartment space.