I checked to see if there have been any complaints filed with the National HIghway Transportation Safety Administration (NHTSA) concerning the window regulator failure, and I only found a few. The complaints that have been filed only cited maintenance reasons. They did not claim that it was a safety issue.
So, today I filed a complaint with NHTSA for my 3 regulator failures and claimed that the failure of the regulator created a safety problem for the rear passengers ( i.e. children can put arms or head out and be injured, cold air in the winter, hot air in the summer, etc. ) all of which are valid safety concerns.
Maybe if enough of us file a similar complaint with NHTSA, they will force a recall on GM.
Here is the web site for filing a complaint
It takes about 5 minutes to file a complaint and you need your VIN#.