Part Type: Engine Coolant Thermostat. OE Type Engine Coolant Thermostat. Type: OE Type Thermostat. 1994 Buick Century Engine: 3.1L V6 GAS; 195 Degree; OE Temperature; Seal included;. 1995 Buick Century Engine: 3.1L V6 GAS; 195 Degree; OE Temperature; Seal included;.