Recreational Vehicle Lpg Tank Valve/gauge problems of the 2011 Hyundai Elantra

City driving; there was the usual amount of "stop and go". As I was sitting at a red light, I noticed some smoke/steam coming from somewhere outside my car. I distinctly remember looking at my temperature gauge to see if it was running hot; but it was still in the normal range. I assumed it was coming from another vehicle around me. The next time I stopped at a red light, I saw the smoke/steam again; this time I noticed the distinct "sweet" smell associated to a vehicle overheating. My temp gauge was still registering as normal, but it was clear it was coming from my vehicle. I turned the heat on until I was able to pull into the next available parking lot to turn off my car and let it sit for a few minutes. After restarting it, the temp gauge registered as normal again, so I drove off. Shortly after, the temp gauge started to register the engine was overheating and smoke/steam was coming from under the hood. Just as I was pulling into another parking lot, the temp gauge spiked. After I parked and let the engine cool a bit, I opened the hood and it was clear that a hose or something had burst; there was coolant spewed everywhere and I saw a small hole in one of the hoses. I had it towed to the nearest dealership; after looking at it, they said the engine would need to be replaced because some oil/fluid had backed up into it, apparently at some point during that ordeal. I believe one of two things to be the cause: either the temp gauge/component failed, therefore not notifying me of the engine overheating; or the engine was faulty. My "check engine" light was not on, and did not come on until after the temp gauge spiked. This issue cost me a total of nearly $6000 in repairs, including a new engine and the component that "talks" to the temp gauge. When this happened, the vehicle was less than 4 years old; I bought it used and had less than 2 years.