2011 Toyota Prius Owners Manual - Page 582

5-2. Steps to take in an emergency STEP 5 If necessary, add power control unit coolant up to the full line. Water can be used in an emergency measure if power control unit coolant is unavailable. (→P. 572) Have the vehicle checked at nearest Toyota dealer as soon as possible. n Overheating The following symptoms may occur when your vehicle is overheating: l Hybrid system output decrease. l Steam is coming from under the hood. 560 PRIUS_U (OM47685U) DVD