While sitting in traffic here in Atlanta my 2023 Telluride warned me that It was overheating. I looked at the gage it it was all the way on "H". I pulled right over and cut the engine off. I never saw smoke nor steam. I got it towed home. I checked the fluids and the raidiator was full. It had 3 miles when .I purchased it and now has 7000. What it wrong with it?