Here's the story.
Driving today to take my 10 month daughter to the hospital because she's had a stomach virus and she is terribly dehydrated. About 5 miles before we get to the hospital I noticed that the fan came on which is unusual for our 6.0. I didn't think too much of and my initial thought was that maybe the EGR and oil cooler were on their way out. So I continued to the hostipal and factory coolant guage never went past the half way mark and no lights or buzzers came on.
Left the hospital to go and get some lunch and again the fan came on. I drove for a couple of miles with the fan on and pulled over to get some distilled water to top off the system in case it had leaked some. I looked underneath the Ex before going into the store and found that the lower radiator hose was disconnected and all of the coolant had drained from the system.
I put the distilled water in the truck and drove it back to the hospital. It seems to be running fine at this point although I haven't driven it for any distances.
What's the probability that I did major damage to the engine?
Would the factory tempurature guage have indicated that the engine was reaching a critical tempurature?
What should I look out for as indications that there is damage over the next few days or weeks?
I feel like a real bafoon because I'm the dip that did the coolant change and apparently didn't tighten the lower hose enough
2004 Excursion - engine build date of Dec 2003.
No Mods or tuners
Never had any major issues other than EGR.
Thanks in advance for any input.