Hello everyone,
I have a 2001 jimmy with 170k miles and recently 2 pc of rubber hoses burned. The connection originates with 2 metal pipes that are connected to the motor exhaust manifold on both sides. Proceeds with 2 rubber 90’s (that melted on 1st occurrence and burned hardness) continues with metal hoses, rubber again and to a T(melted on 2nd occurrence).
The third hose is connected to some type of motor at the bottom front of the vehicle.

I would like to know what causes this problem and what to do to solve it.


Thank you very much in advance to all who will provide info.

Sounds like secondary air system problems. Most likely the check valve failed allowing exhaust into the rubber hoses and melting them.