I have a 93 eldorado w/ northstar, for some time my computer tell me to check coolant , i always have to top it off now there is no leak and no water in my oil, it nevver overheated till today while i was in traffic w/ the ac on the compressor shut off then it said coolant hot , then it went to engine overheated stop engine i stop engine was able after some time to add water the engine now had no power like it was in a limp home mode, will the computer reset after it totally cools down? and did i do major damage?