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what is in tank next to synergy center under hood on 2004 Toyota Prius

it contains pink fluid

Asked by for the 2004 Toyota Prius
poss pwr steering fluid be more specific please
I called guy who works for Toyota and found that it is special Toyota coolant for synergy system and you can only use Toyota coolant because something about electricity passes thru to make system work and you can ruin inverter and system
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1 more answer
It is the cooling system for the underhood AC/DC inverter. If it is down on coolant, check for leaks. If the inverter dies, it is big bucks. Prius has an electric power steering motor. There is no power steering fluid in this car.