98 pete fan clutch issues

I know on my Pete w/Cummins, air supply engages the fan clutch, no air-no engage .....The solenoid may be a "normally open or normally closed" version....On mine, if the solenoid has power to it, it "opens" allowing air to flow to the clutch and engage the fan.....When the engine reaches high temp (normally around 195), a thermal switch activates on the engine and completes the circuit, giving power to the solenoid and engaging the fan clutch....A separate switch on the dash allows one to manually activate the solenoid to engage the fan clutch also.....First figure out if you have a normally open or closed solenoid circuit and go from there...From the sound of it, it sounds like mine, disconnect the wire going to the solenoid and see if the solenoid closes and shuts the air down, this should release the fan clutch....There should not be continuous power to the solenoid, only if the engine reaches temp or you switch on the dash override switch.....

 

If the problem started immediately after you replaced those, then that's where you should start looking.

 

A malfunctioning low coolant level sensor will power up the solenoid too.....

 

Yes, the question is why is power getting supplied to it when it's not needed?.....If it was not doing this before you changed the parts, I would check to make sure you got the right part(s).....If you have a test lamp, check for where the power is coming from to the solenoid....Basically, process by elimination....Be thankful it's not an intermittent problem, they can be a real pain to figure out, good luck...

 

Always look at the last thing you did before the problem started.

 

Check the connectors. Sounds like one of them might be loose. Maybe one of the pins has backed off, or a wire has broken inside the connector.