Odds are you will be ok. Just last month my daughter was using my 04 YukonXL and while driving (in town just coming off the freeway) massive white smoke started pouring out from the hood. She pulled over at a gas station which just happen to be right there and it would not start (due to overheat). It was late at night, she called some friends, they came over and pushed it into a parking space and she left it there for me to deal with in the morning. When I got there and popped the hood, the driver side heater core hose had snapped off (its that T shaped white plastic connector) at the hose connect - dumping the entire coolant on to the engine. I went and picked up a 5/8" hose splice, cut both hoses and spliced them together (bypassing the heater) and refilled it with a ton of fluid (it was completely empty). Ran like a champ - the sensor worked as intended and protected the engine. Once I got it home, pulled the codes, cleared it and my patch was working well. Since then I have replaced everything that is hose or plastic in cooling system so we don't have that again - all that stuff is 16 years old and getting brittle. I did a compression test - no issues - not bad for this original engine with over 220k miles. Short story - as long as the computer did its job and the temp sensor did its job shutting the engine down AND you have been keeping clean synth oil in it - you should be good.