Little wrench light came on and went off. What up?????????

I so appreciatte u taking the time to answer my question. I have read alot of bad reviews of this truck/engine and what I was thinking is a truck with this many miles must have had all that stuff fixed by now. It seems like there is alot of recalls on this year model and I am trying to get a copy from the FORD house of all the warranty work done on it. What is the best/worse case senerio you can think of for my problem? Also one other thing, I pulled up to a red light and it started smoking white smoke(ALOT) and I looked at the gauges and the heat was up but not in the red or anything. I checked it and it was low on antifreeze by a gallon and a half. Filled it and no problems since. Today I had to add another gallon so it must have slipped by me when I bought it. The truck is perfect and the motor and undercarriage is soooo clean it looks new> Really, just like new. Not washed! Any help for an electrician and not a mechanic is greatly appreciated. Thanks man, really.