One problem related to defogger heater has been reported for the 2005 Toyota Sienna. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2005 Toyota Sienna based on all problems reported for the 2005 Sienna.
Coolant dripping under the muffler when the brand new van was driven 955 miles and the dealer still fixing it. This is the third time the van is in the dealer for the same problem and totoally they has spent 15 days. They said it was becasue something was wrong with the rear heater core.