Crawling around under my 1996 Buick Roadmaster Estate I discovered one of the air bags I have connected to the self leveling suspension has blown out. Since it was in the direction facing the nearest part of the exhaust I assume it was heat related. Ironically when I tried to reposition the heat shield some it broke off and I had to replace the shield and the air bag. Luckily I had bought a new set and installed it when I last worked on the suspension. The old set was still on my shelf since I didn’t see any problems with it.