The powers of the council or board shall be purely legislative except as may be otherwise provided by any other act or by any article of this Code other than Articles 3 or 4. The executive and administrative powers conferred on the commissioners by Article 4 shall only be exercised when delegated to the appointive officers provided in this Article 5.
The council or board shall approve for payment all expenses and liabilities of the municipality.
65 ILCS 5/5-3-6