How a liquid coolant can be aged or deteriorate them? What happen to the liquid coolant?

Normally the liquid coolant perform well initially but after a period of time (coolant for CPU ~3months) the performance decrease. I would like to make them defect in a week. Can this possible? Under temperature and pressure or shaking them? How the changes inside the chemical of the liquid coolant?How a liquid coolant can be aged or deteriorate them? What happen to the liquid coolant?see this wensite