Medium and Heavy Trucks
Have Truck Repair Questions? Ask an Expert
Hi Ed. My name is***** will be glad to help. Try using shop air separately to the fan hub to see if there are any leaks in the fan hub and see if you can engage and disengage the fan hub manually with shop air to confirm the hub is okay. If okay verify ground of the solenoid as it is the ECM that grounds the solenoid to engage the fan. Inspec the wiring and temp sensors/switches. Let me know
First for test purposes disconnect the existing ground and run a test ground to see if you can get the fan to engage. If so you will then inspect the wire to the ECM for damage. If thats okay there is a reason why the ECM is not connecting ground to command the fan on. Could be a fault sensor or loss of input signal from a sensor that tells the ECM to turn the fan on. The diagnostic software will allow you to monitor live data and switch status in live data.
Sorry I mean disengage
Thats what I just said in my correction I said engage and saw the typos
Spring engaged and air released
The ECM commands the ground to engage and disengage the solenoid
Hi, Did you get this resolved? If so please take a moment to rate my service as that is how the site credits for my time helping on the site.