Re: intermittently 1 sec growling (?) at hot summer
A friend of mine (BManz on here) still has his 2011 Hemi WK2 that had the howl/growl occasionally and I heard it a few times last summer during a visit. He got the brake booster recall and that was the fix to the weird growling noise. He suspected a vacuum line to the intake or brake boost and he was validated when he started getting a hard brake pedal overnight and then the recall notice came from Jeep.
Check with your dealer to see if you have one of the vehicles covered in that particular recall. Hope that helps track you to a solution.
An expert is one who knows more and more about less and less until he knows absolutely everything about nothing.
2013 GC Ltd Hemi (2nd Jeep)