Good morning J and welcome to the forum.
From the pic; thats a mighty nice looking Suburban.
Please go to Your profile page and where the signature line is, put in year, make, model and any info on midifications You may have installed onto such a fine looking unit.
That info will help the techy members to make posts on what could possibly be needed to correct any issues.
If You are in the forum on Your phone, turn the phone horizontally then You will be able to see and read the signature lines of other members that throws in a posting.