Fan clutch?

[JimT]

(06-25-2020 )Lonestar10 Wrote:  you can splice a wire into the fan solenoid but i beleive the truck will throw a code every time you use it im not sure if its ECM or BCM that needs to be reprogrammed or tapped into to do it perfectly.

the solenoid always has + the BCM/ECM grounds it to turn on the fan so you would run a 2nd ground wire to it.


another way to get around this would be install a second solenoid after the trucks OEM one and you can choose how to wire this one either constant + or constant ground with the switch engaging the opposite. this way the ECM wouldnt know the fan is being turned on and the ECM/BCM solenoid would continue to work as normal for fan engagement.

only problem with installing another solenoid or installing a controllable ground without going through the ECM/BCM is that the fan clutch will not shut off at certain rpms that can cause the fan to self destruct if you accidently over spin the engine.

All great points, thank you. My main purpose would be for use while parked to bring the temp down a bit before shutting the engine off. But you gotta think about edge cases and if I sell the truck what would someone else do with it.

As for blocking or shutting off the error seems less elegant. Plus, it would make it more difficult should an actual error occur at some point in the future.