One problem related to radiator has been reported for the 1999 Saturn SC1. The most recently reported issues are listed below.
Purchased car June of 2004. Car was one day old and the fuse panel had to be replaced. Then oil was having to be added. Called Saturn and was informed Saturn cars have a been know to go through oil. Car seemed to be running hot added coolent to notice the coolent seemed to be thick with oil. Flushed system added new coolent. Car ran even hotter was told oil in radiator, need to put in new radiator. Did this and problem was not fixed. Was then told heads were cracked. Called Saturn after seeing numerous people on web site with same exact problem. They informed me there was recalls on faulty engine up to 1999 model. And 2000 model. My car year was missed.