One problem related to air conditioner has been reported for the 2004 Toyota Sienna. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Toyota Sienna based on all problems reported for the 2004 Sienna.
This is a complaint, not necessarily a safety one, but a complaint nonetheless. The air conditioning went out twice & had to be replaced two times. Very expensive repair. Disappointed in my Toyota.