I have had my 2019 AWD V6 Blazer back to the dealer 5 times for interior rattles. I got it the end of February and currently have 16K miles on it. After 4000 mi I heard a snapping sound coming from above the b-pillar on left side. It occurs going down the freeway on bump roads. Related to temperature. Dealer ordered the trim at top of B-pillar with the seat belt up and down adjustable retractor Technician said the plastic broke away from the clip. Had another rattle from passenger window area. The molded plastic around the inside door frame rattled. Technician put some foam strip under it and and it worked for 2 weeks. Rattle came back as well as plastic molding around the left rear window frame. Brought back and supposedly got fixed. 2 weeks later had rattles on right interior door panel. I looked at it myself because I was getting very irritated bringing back to dealer. Found one of the door panel clips pulled out of door panel and another not even pushed in hole but next to it and cocked. I believe the last technician did not put this together correctly. I put all the clips in correctly and that fixed that rattle for a few months. Ended up putting foam tape in areas under the passenger door panel. Weeks later, the upper trim around interior door frame started to rattle again. I put foam tape around all of plastic trim . The left rear upper trim around interior door frame started to rattle again. I put foam tape all around that plastic trim. A month later had rattles coming from both b-pillar areas again. I took left side apart and found the metal v-clips that go into the slot of the metal body vibrating. I put foam tape over the metal clips and snapped trim back in. Did this repair on the right B-pillar trim as well. Weeks later heard different noises from both B-pillars. Took apart and put in quilt foam insulation under the entire B-pillar trim. After a month of no rattles the original snapping noise above the drivers side head liner came back. I took the headliner down on the edge and and inspect. The side air bag was making the noise. I lined the headliner and air bag with in the same quilt foam insulation. All snapping and rattles were gone for a month. The same snapping noise by the drivers side air bag was back. Tried to adjust the insulation but noise was still there. The passenger door started rattling at times as well. The backs of both front seats had come unsnapped as well. Brought the Blazer back to dealer this morning for the 2 rattles and the seat back coming apart. I have owned 12 GM vehicles over the years of which 6 were brand new and had good luck with all. This whole poor quality interior fit with this snap together cheap plastic crap makes me feel like this $40K vehicle was not the right choice this time around. I usually keep my vehicles 8 to 10 years but having this many rattles after 8 mos makes me want to trade it in already. With the GM strike and very limited parts available GM is very disappointing these days.