In recent months my '08 GX 470 engine sounds very loud on startup - like all the fans are on. This only happens if it has been sitting overnight or longer than 5 hours. Outside temps aren't a factor since it sits in a heated garage. I took it to the dealership, they checked it out when the engine was cold and noted the "excessive engine noise" was a normal condition. No way. I've been driving it for well over a year and this is new. Someone has suggested it is the fan clutch acting up. I want to get this resolved. Has anyone else had this problem?
