One problem related to radiator hose has been reported for the 2002 Toyota Sienna. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2002 Toyota Sienna based on all problems reported for the 2002 Sienna.
Purchase 2002 Sienna ce in June 2002. Have leak in top radiator hose where it joins the engine. Looses coolant over several weeks. Brought to Toyota dealer where purchased and they refused to replace the hose. Installed a new clamp. Now 3 months later the problem is back. I believe this is a bad part that should be replaced under the warranty. The dealer is giving me the run around.