2022 GMC Sierra AT4
My truck has developed a musty smell, wet dog, gym bag.. whatever you want to call it. Its exceptionally bad when closed up and in the sun. I think, but not convinced, its worse after rainfall.
I have not found any wet/dampness anywhere in the cab or surface of carpets. Nothing is wet along the back wall under the window. There is no sign of water (yet) to be found.
I have replaced my cabin filter and done the lysol trick. I thought that his maybe had solved it, but a heavy rain last night peaked the smell again.
Since I can find no dampness in the truck, I'm really struggling to find the source.