One problem related to radiator has been reported for the 2005 GMC Envoy. The most recently reported issues are listed below.
I had three cars in front of me stopped. I did not see any breakl lights and I hit the car in front of me pushing the other cars to hit each other. My front end of my car was severely damaged bad enough to damage the radiator and destroy my ac unit. I'm not sure what else was damaged. It sent the person in front of me and myself to the emergency room. " my air bags did not deploy ". My vehicle was moving on a city street.