First of all when you do the gas pedal 3 times method from before you must have the key on engine off position. Second if the doesn't work look in the fuse panel for what should be a red fuse the says reset or something of that nature(its a button not a fuse so it looks different than the other ones, should be a solid color, not transparent). There are 3 fuse panels on the grand am, first one is under the hood, second is on the side of the dash board(you need to open the door to access it) the third is on the opposite side same exact way as the first. Should either be under the hood or the divers door panel. If your car is over heating check a few things. Make sure your water pump is working, electric fan, and radiator are in good shape. Since your radiator was replaced im assuming you got all the air out of the system but just in case you didn't be sure to get all the air out of the system because these air pockets heat drastically and will mess up your readings on the dash. A coolant flush is never a bad idea either if you have the cash to have a shop do it. This will be sure all the air is out and there is no blockage in the system(assuming they know what they are doing) Hope this helps out!