Taylor_S

We recently purchased a 2022 GMC Sierra 3500HD diesel, and just noticed a loud, repetitive noise while idling. It starts, stops, and starts again in a rhythmic timing. It sounds like it’s coming from the air intake area, but I’m no mechanic so I’m not sure what it is. It doesn’t do it consistently, and I notice it more on colder days (30F or below) when letting it warm up in the morning. I’ve found similar discussion which mentioned it being the fan clutch, but others say they’ve replaced it and the sound continues. Is this just an annoyance or something that will wreck the vehicle if it’s not addressed? We haven’t even made the first payment on it yet so I’m pretty distraught over a potential costly repair. It only has 9k miles on it and is practically brand new. This truck was purchased to haul my living quarters horse trailer all over the country, so this has me concerned as I don’t want to have any major issues while on the road with a loaded trailer.