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I would check the hose and then just start working backwards. Due to you dirt come out the other side I would guess it maybe some type of dirt& sand.

Yes there should be air to the fan actuator all the time.

Sorry if I said that, but on the M939's you need to use a N/O solenoid. Some over trucks you may need to use a N/C solenoid.

You are over thinking this like I did before the little light came on. You just remove the stock fan actuator and put in a two wire elec. fan switch. Then you use the same hoses that went to the old actuator and hook them up to the solenoid. set it up for n/c. No new hoses to add. The solenoid...

I also put a manual switch in my cab to turn on the fan. Yes the solenoid needs to be a n/c one. But most of the truck ones will do both, you just have to move the vent. I do have the stock actuator if you need one, I'm going to switch over to all elec. ones in my trucks.

Yes you are right, the system has to vent the air when it turns off. I just went though this with my AC install. You have to use a solenoid that vents when it closes.

I am interested in having a manual fan switch (air or Elec.) but keep the automatic fan switch also. The problem I am having is venting the air when you turn the manual switch off . I saw the switch from Eric's and that looks great but when the auto switch turns on it will vent out that switch...