So recently the YJ has developed a high pitch whirring noise in the engine bay and I can not for the life of me figure out what it is. At first I thought maybe it was that the belt was old and I knew it needed to be replaced. NOPE. Maybe it was that the fan clutch stuck. NOPE. A guy that I worked with suggested maybe a vacuum leak somewhere.
The ALMOST sounds like my dad's old Blazer when the fan clutch would stick when you first fired it up, and then it would correct itself and sound normal, except mine doesn't quiet down. The noise is there when I start the Jeep and gets louder with higher rpm and quieter with low rpm.
What I have
done thus far in regards to this issue:
-Changed the belt
-Replaced the idler pulley
-Replaced the fan clutch
-Replaced a couple dry rotted vacuum connectors
Things I haven't
-Anything inside the block?
Below is a link to a youtube video of the sound. In the video you can hear a high pitch whining, but it is kind of exaggerated due to phone recording audio quality. I'm sure the YJ masters on here will have some input. Thanks for taking a look and listening to the video.