Decatur is a small city located in northeastern Georgia, just 5 miles northeast of Atlanta. The city was founded in 1823 at the intersection of two Native American trails and named after US naval hero Stephen Decatur.
The main function of a head gasket is to hold engine compression while keeping oil and coolant circulation separate. Undetected blown head gaskets cause coolant and oil mixing, which could lead to severe engine damage, such as engine block cracking.
Why would a bad head gasket cause the coolant reservoir to fill up? I noticed my car was overheated today, so I pulled over. It only took maybe a minute (with the car off, hood open, and fan on) for the temperature gauge to start falling, so I figured that I probably hadn't done any major damage.