[JoshFFuller]

I have a Grand Am SE 2001 and recently, since I got home from college for break, there has been no noticeable heat, and the engine temperature gauge is reading below 100. I checked the heat of the input and output hoses near the firewall and both were warm (warmer than the air blowing in the car) but not hot to the touch and this was after 10 minutes of driving 40 mph. Right now my only ideas are the thermostat or the heating core, could anyone suggest what to look for? I'm not sure, short of replacing both, how to progress. Alos wondering if driving it in this state is bad for the vechicle, I can't seem to find anything wrong with the engine and all other parts are working fine, not much chance to fix it for a few days.