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Filling the Cooling System with Antifreeze

Model: Toyota Prius MK 1 - Years: 2004, 2005, 2006, 2007, 2008, 2009
Part: Antifreeze coolant

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The cylinder-piston system generates friction and consequently high temperatures: antifreeze mixed with demineralised water forms the coolant, which also serves to protect the engine from excessive temperatures (which would primarily compromise its lifespan) and control the engine oil temperatures; without it, evaporation and residues would be a risk.

When filling the engine's cooling system, always use antifreeze, and it is very important that no air bubbles are generated in the system during this phase: there is usually a valve on the system for bleeding, as shown in the video.

The coolant for engines should typically be changed every two years.


Updated on 15 February 2026 by ScegliAuto


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