It all depends on what the coolant temp reached. A large variety of conditions can cause the coolant temp to rise and the fan should come on at a certain temperature to get the air flow up - it's the only option the system has left at that stage.
Originally Posted by DeclanM3
It was at speeds between 60-80 when it occurred. I could be wrong but don't think a fan failure would make that much of a difference at those speeds?
If the fan doesn't come on due to a faulty sensor, faulty fan motor or dodgy electrical connection or something, then the overheat condition will continue until one or more of the other variables is changed for the better.
I never rule out anything...but I have never (in many decades) seen intermittent mechanical water pump failure.
Last edited by Brissyjohn; 12-18-2012 at 02:50 AM.