Scenario: Drove my '13 Bull about 100 highway miles. Get to the city and while waiting in Walgreens drive thru for the meds I confirmed were ready the day before but now were oddly not ready (that story isn't related to my current vehicle issue), the red temperature light flashes along with the "this is going to cost you some serious bank" audible warning. Me, in a near panic, revved the engine knowing that doing so had zero effect on cooling. Be that as it may, the light disappeared oddly enough. I grabbed my now ready meds and gently drove the Bull to a nearby family members house. Ok it was my mom's place. A little backstory. A couple of years ago I had to have the water pump replaced. I was way out of town, and it cost... I'll just say a lot. Back to present day. So, I got to my mom's, pop the hood and just look around as if I know what I'm doing. Good news at that moment was I didn't smell my bank account losing funds, aka I didn't smell antifreeze. I didn't see any leaks. No spray anywhere either. Basically nothing out of the ordinary. I let the beast cool for a while then I popped the coolant reservoir and it was Sierra Desert dry, not a hint of moisture. Long story even longer, I fill it with what's avail; garden hose water and leave the cow overnight. Post good night's sleep I checked the tank in the morn, and fluid was holding. I ran the pup in the yard to temp, and didn't see any leaks. I took it for a ride around town, all was good. Drove it the hundredish miles back to my crib, no issues. Checked the tank after it cooled, and the level was fine. Never found anything leaking, car always ran fine, no interior leaks, oil is black as...well used oil, and no tail pipe smoking. Anyone out here have a clue?? I plan to pressure test and flush, but other than that I'm stumped.