2007 Pontiac G-5 from time to time the temperature reading on the coolant will register ---F instead of a degree. Shortly thereafter then the check engine light will come on. Eventually the correct temperature reading will re-appear I have had it at the mechanic's twice but was unable to pinpont the problem other than it is possibly a sensor. This did not happen all winter but now with warmer weather it has started again. Of course when this does occur the cooling fan runs continuously. Any suggestions rather than just randomly replacing the sensors?
Mar 18, 2011 at 6:05 PM
