HD's running hot?

Recently I had to move to a new place, and due to extreme space conflicts, my comp must now reside in a not-very-well-ventilated corner.  I usually keep my system running 24/7, and a few days in, it began running erratically, restarting itself.  Upon opening the case, I found the hard drives to be searing hot to the touch.  Now, I'm not the most experienced here, but I've had to open my case up for various reasons over time, and can never remember the HD's being this hot.  I immediately shut down, unplugged, and moved the comp out to a better ventilated spot to cool down.  Unfortunately, it needs to go back to that stuffy corner if I want to be using it again due to my apartment's setup.  Is the ventilation the problem?  How can I alleviate the problem if so--do I need more fans perhaps (let us assume that the comp NEEDS to be in that corner and skip the "try moving it" suggestions)?  I'm sure flaming is inevitable, but I'm not all that experienced yet.  I do know that I've been running this system in exactly this configuration for at least a year now with few problems, so I'm guessing it's the airflow in that corner?

>>9

Most hard drives should not go over 140 F. I would use the software posted >>6 to make sure this isn't happening. Usually any hard drives manufactured within the last few years should have a temperature sensor.