One problem related to engine cooling system has been reported for the 2007 Toyota Sienna. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2007 Toyota Sienna based on all problems reported for the 2007 Sienna.
With no warning at all the engine cooling lines just ruptured in my drive way spilling oil all over the front of my house on the concrete and I have seen people on line with less mileage then my 07 Sienna xle having the similar problem something about cheap rubber was used to make these lines there is even a you tube video on this matter . . This a safety concern glad it happen in front of my house instead of on the road with my family on board .