Part Type: Engine Coolant Thermostat. OE Exact Engine Coolant Thermostat. Type: OE Exact Thermostat. 1999 Volkswagen Golf Engine: 1.8L L4 GAS; 188 Degree; OE Temperature; Seal included;. 2000 Volkswagen Golf Engine: 1.8L L4 GAS; 188 Degree; OE Temperature; Seal included;.