PFL S3, yesterday while driving coolant warning came on and after stopping to check, it’s indeed below minimum level, so I went into a store to pick up some distilled water for the time being, took like 15 mins.. I slowly opened the cap to let the pressure out and to my surprise, once the pressure is out, the coolant level went right back to close to maximum level! I didn’t have to even add water, been driving all day since and this morning as well, no more warning so far, should I be worried and get it looked at??