2012 Toyota Prius Owners Manual - Page 807
2012 Toyota Prius Manual
Page 807 highlights
5-2. Steps to take in an emergency STEP 4 After the hybrid system has cooled down, check the power control unit coolant level and inspect the cooling system for leaks. STEP 5 If necessary, add power control unit coolant up to the "F" line. Water can be used in an emergency measure if power control unit coolant is unavailable. (→P. 499) Have the vehicle checked at nearest Toyota dealer as soon as possible. 5
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