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One of the first rules of electrical troubleshooting, besides not letting the magic smoke out, is that voltage is only good if measured good under load. The tiniest fragment of a crappy connection will still pass full voltage throughout the circuit untill current starts to flow when it is...

24v at the solenoid = fan OFF. No voltage at the solenoid = fan ON.. so when you unplug the sensor the power at the solenoid should disappear, which wpuld be perfectly normal. It is also normal for the solenoid to energize when you turn on the ign switch and to de-energize and vent air every...

Yep, unplug the sender or selenoid. To remove fan air and engage the clutch, that is of course with a working solenoid...

Well if there is more than 85 PSI in the tanks. You should hear the solenoid send air to release the fan clutch when it is energized, and it should cutoff supply and vent the line to the clutch, releasing the air and engaging the clutch. You can also disconnect the airline right on top of the...

What truck is this on? On an A0 CB22 sends 24v thru a 205F normally closed sw to power the solenoid. The solenoid provides air to release the clutch. When the temp goes over 205, the switch opens, solenoid releases the air and the fan engages. The fording sw bypasses the temp sw to feed power...