Xsyourrides

I purchased new 2020 Chevy High Country in June this year and had zero knocking noise. Dealership damaged the truck paint and had to buy the truck back and order me new one. I drove the truck as a demo for 5500 kms and 3000 kms of that was towing 15,500 through the mountains with no knocking noise or thumping noise. Picked my new 2020 High Country yesterday , same exact truck. No noise at the dealership, drove it home 90kms backed into the driveway and low and behold the knocking noise was there and in my opinion it was loud enough I could even hear it over the radio. Being a sleepless night pissed right off about why one didn’t have a noise and the exact same truck is knocking . Went out and crawled all over that truck listening, being that I’m licensed HD tech and been dealing with diesels for 30 years I needed to figure it out. After 1 hour of getting nowhere and truck had been idling for hour plus and was convinced that it was not coming from the bottom end, all of a sudden the noise was gone! The engine fan cycled on and noise disappeared. Once the fan kicked out the noise came back. So it kind of goes with earlier statements that it maybe the drive belt. So Maybe a bit of interesting find.