RepairPal Certified shops can diagnose and repair your 2004 Toyota Prius. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
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
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.
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