Nicole Cox Posted September 25, 2017 Share Posted September 25, 2017 (edited) WF transit thermo cooling fan stopped functioning. It kicks in for a short time then stops. Looking for some assistance. Fuse looks ok Edited December 5, 2018 by robertlane Quote Link to comment Share on other sites More sharing options...
Fifty150 Posted September 26, 2017 Share Posted September 26, 2017 Sounds like it's time to raise the hood, and do some troubleshooting. You will need a factory service manual. Electric fans on modern vehicles are turned on and off by the vehicle's computer system. The computer system monitors the vehicle's sensors to determine when the fan needs to be on. The problem can be anything from a bad sensor, to a loose wire, and as you've guessed, a bad fuse. The fan relay could be bad. The problem is rarely mechanical, i.e. a broken fan. But that could be your starting point. Apply 12 volt direct current to the fan, and make sure that the fan works. Then it's time to carefully check all connections and test the sensors. I worked on a car where the actual mechanical thermostat was stuck. Simple. The spring loaded mechanism was corroded and stuck. The thermostat wouldn't open. None of the coolant was able to flow. The sensors for the fan were inline with the cooling and return lines. Those sensors never saw any temperatures high enough to turn the fan on. Of course not. The hot fluid was stuck in the engine block, because the thermostat never opened. Of course, you might just get lucky and find a loose wire or a corroded harness connection which could be easily replaced. Or maybe the fan is actually broken, and you could just drop in a new fan. Quote Link to comment Share on other sites More sharing options...
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