One problem related to radiator hose has been reported for the 2009 Toyota Sienna. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2009 Toyota Sienna based on all problems reported for the 2009 Sienna.
The oil cooling hose popped while driving car. Apparently there was a recall/service bulletin for this issue involving other Toyota and Lexus vehicles. For some reason there was none issued for this vehicle. Now there is engine damage. Toyota dropped the ball on this one. They need to be held liable for the damage.