While driving there is a grrrrr sound under the hood?

Can I ask if the noise happens when the A/C is on? is the noise coming from the front or rear of the vehicle?

No, it doesn’t. It’s like a ummmm sound very low , you can hear it and feel it. You would think something would pop up on the dashboard, like maybe a sensor, but it doesn’t. Like I said it only does it when you’re just sitting back cruising along. The vehicle runs well and shifts normally.

Does it seem like it goes with the road speed? Also does the noise change when you steering slightly to the right or left? I am thinking it is a bearing hub. Can you please shoot a quick video with your phone so I can hear the noise? That way I can tell for sure what's going on. You can upload it here with your response.

It just makes the noise when I’m just cruising along, you can hear it under the hood. It’s like a Rrrrrrrr sound that lasts a split second.

It sounds like you have a serpentine belt idler bearing or belt tensioner that needs to be replaced, I would install a new serpentine belt as well. I would remove the belt and spin the pulleys to see if one of them feels rough or makes noise. Check out the images (below). Please let us know what happens.