1998 900 has been running perfect. Was at a stop just accelerated when there was a loud boom and steam from front of car and vents. Radiator blew out the plastic side. Prior to this car was perfect, excellent power, no leaks, no white smoke, no fluid from exhaust.
Overheated, too much pressure and broke the radiator. It will need to be replaced and also the reason needs to be found that this happened. Make sure you have the cylinders tested for possible blown head gasket.