Hey folks, just bought a 2000 SLS with 12500 miles on it. Everything seemed perfect until I got a CHECK COOLANT light the other day. The coolant level seems fine, but from doing some research her and on GMForums, it seems that this is a warning sign of head bolts pulling through the block, possibly causing a head gasket leak. Fortunately the car is still under factory warranty with an extended warranty after that. What else could it be, or is this generally what it is a sign of? How long of a job is this at the dealership, and while under factory warranty is a loaner provided? Thanks a bunch and hope to do a lot of reading here on the forums.