2004 GMC Envoy body & structure problems

While driving another motorist saw smoke coming from rear of vehicle and got vehicle stopped on side of road at which time the engine compartment was engulfed in flames. Called fire dept and police. Fire spread through the hearer box into the vehicle and across dash until it began burning the headliner. Fire dept put out fire but was a total loss. There was no indication on instrument panel of any problems (all gauges showing normal readings).

Tl* the contact owns a 2004 GMC envoy. While the vehicle was stationary, the exhaust manifold fractured and the heat from the exhaust manifold damaged the frame of the vehicle. The contact stated that the failure caused severe rust and corrosion. In addition, the contact stated that there were holes in the frame. A dealer was not made aware of the failure. The manufacturer stated that the failure was not safety related and there were no recalls on the vehicle. The failure mileage was 136,000.