One problem related to vehicle overheat has been reported for the 2010 Toyota Prius. The most recently reported issues are listed below.
Driving on freeway and car overheated. There was never any warnings of overheating problems before. Pulled over on freeway and had car towed to auto service. Water-pump was not working, fan stopped turning, cost to replace was $1260, Toyota would not help as car was out of warranty.