One problem related to engine exhaust system has been reported for the 1998 Oldsmobile Silhouette. The most recently reported issues are listed below.
While driving van the temperature gauge showed hot and heater stopped blowing hot air few minutes later it cooled back down and started blowing warm air and it continued to do that over and over put a thermostat in it and it did not help it continued to do the same thing it is full of water still not blowing any warm air out and steaming out the exhaust.