Yes there was a thread on this a while back. It mostly happens when the Jeep has sat a while or if you start it with the a/c on. I determined it is the belt vibrating or grabbing when there is a load on it like the a/c. Just a theory though and I have experimented with it starting with a/c on and off. but it only happens when the Jeep sits overnight in my case. I cannot duplicate it after the initial startup.
I do not think it has anything to do with extreme cold. Rare 50 degree temps here. It has to do with sitting overnight. Does not happen all the time but mostly when I start it with a/c on. I am almost certain it is the belt either vibrating or dragging. Need to get somebody to look under the hood when you start it. I do not have anybody to help as of yet.
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