I needed to know if you could help me diagnosis what is wrong with my 1992 Firebird. It shut off when driving and the coolant is boiling. My boyfriend and I just fixed the thermostat. It makes a bubbling noise but that's the coolant boiling and it goes low on the oil fast but no leaks. It can make it about 30 minutes before it gets overheated. What do your think the problem could be?