My f150 started making loud noise at least three times unit now at dealers said they can't find anything unit still under warranty they have it two days said no problems with air conditioning clutch. Bowler motor motor no fuse problem no belt problem. Sounds like a airplane taking ,dealer said it's normal
Mark problem so there is no damAge to engine or air conditioning unit. Oh well just waiting to hear back again it was98 degrees on the last loud noise I turned off the engineer and it stopped. I feel a bearing is going out I want it fixed before warranty runs out.