One problem related to coolant leaking has been reported for the 1998 Buick Century. The most recently reported issues are listed below.
Brought vehicle to dealership for brake inspection. Was informed the lower intake gasket was leaking coolant. Had it replaced by dealership on 03/07/2006. On 06/28/2010, the same issue seems to be re-occurring. Should an intake gasket need replacing 2x's under normal driving conditions?.