Yet another question about this fan clutch solenoid

Find out if it works air on fan on or air on fan off, hook up using dir. on paper in box.power wire is same way,

 

Make, model and year would help....

 

Does the fan turn free with air going to sol. and not to fan? with eng. on and fan switch on ck. if ele. switch on sol. has 12V. then does fan have air going to it?

 

Check the voltage reads on the leads to the solenoid and come back with the readings. I had a similar problem on a company vehicle not too long ago, that turned out to be a simple loose wire. Power should be consistent to the unit, not on/off. ECM has nothing to do with activating, that's all thermostat based and it will automatically feed power to the clutch in order to activate it.

You probably have a break in the line somewhere. It's a PITA- but once you find it, it's an easy fix.

 

U have key ON, an fan switch fliped on at dash? no power, then ck. all fuse in box to be sure none have poped,