[Gazxr6]

There’s a intermittent wooing loud sound that comes and goes it appears to come from the passenger front side area
The sound will stop after restarting then only to start again after a short time. Not affecting the running or operation of the Jeep but is occurring more frequently any clues?
2011 Grand Cherokee Diesel

 

[pedalyurassoff]

that's tough, but the only thing i can think of for now is to try it on different climate settings. try auto, then try different modes/fan speeds. It could be a damper that closes/opens slowly. Particularly between feet and defrost modes. You could also check your cabin filter, if you have added one. The fan is multi-variable speed, so you could try putting it in auto while you are driving, and changing the temp setpoint close to the inside termp (slow) or setting it 10 degrees or more away from the inside temp (fast) and above (heat) or below (a/c) to see what, if any difference it makes.