The thermostat in the Opel Astra G 2.0 DTI (2001 model) is located next to the oil dipstick, where a visible water hose connects to the thermostat tip. It is recommended to replace the entire thermostat assembly, including the housing, rather than just the insert, to avoid compatibility issues. A user reported purchasing a complete WAHLER thermostat set for 120 PLN. Summary generated by the language model.
