The fascia is not removed as part of the radiator replacement procedure on this model. This is a really nasty radiator to replace; I have printed the step by step procedure for remoiving the radiator for you below (please excuse teh numbering; the software we use to upload the steps changes the numbering sometimes, but they are all there in sequence).
THe labor guide says that it should take an experienced GM technician around 3 hours to complete a radiator replacement on this model. If you have never done the job before, it can sometimes take twice as long.
Here is the replacement procedure. IF this is helpful and answers your question, please click my accept button! Thanks!