I noticed a whine on my 05 CC at 57,000 miles, I brought it in and sure enough....timing chain guides are worn. Fully covered under factory warranty, good thing too, the bill was $1300 at Peoria Nissan. They had it for 2 days.
After I picked it up is when the fun began. I got 8 miles from the dealership when stopped for lunch. I came out to find a puddle of antifreeze dripping from the truck. Back to the dealer, they say is just a bubble in the cooling system, purge the system, and give it back to me.
5 miles down the road the temp guage starts bouncing like Dolly Pardon on a trampoline, so turn round and start heading back. On Bell road in front of Arrowhead Mall the temp guage pegs full red HOT, engine goes into limp mode. I manage to drive the final mile SLOOOOOWLY and coast into Peoria Nissan.
Needlessly to say, I was doing my best impersonation of a steam locomotive. 3 hours later the tech has completely drained, flushed, pressurized, and purged the entire cooling system. I demand written acknowledgement of an overheating event due to an error on thier behalf in case the heads got warped and I blow a head gasket in the future. And I drive, carefully, away.
Every since then though, the truck sounds like chitty chitty bang bang! Especially at idle, the exhaust just rattles like crazy. I give up.