Air Conditioner problems of the 2013 Toyota Sienna

For the past 6 months, our vehicle, a 2013 Toyota Sienna that we purchased new, has emitted a very foul odor from the air conditioning system. From all the information I have, this appears to be from mold growth. I am worried that aside from being extremely unpleasant, it is a safety concern. After numerous trips to two different Toyota dealers for service, an inspection by a southeast Toyota representative, and following all the guidelines found in the technical service bulletin, we have not had any improvement. The odor is sporadic but persistent, usually occurring several times a week. As I've explained to Toyota, there are three distinct "smells" (vinegar, wet dog, and one just very, very bad). We filed a formal complaint with Toyota last spring, wrote letters to many Toyota representatives, met with the general manager at the dealer where we purchased it, and have been in phone contact the past three weeks with a representative from the office of jim lentz, ceo and president of Toyota north America. Toyota maintains this is an environmental issue and not a mechanical one, therefore they won't fix it. I have other vehicles in the same environment without this problem. Being that this van was purchased new, my first new vehicle ever, makes it even more upsetting. While one dealership said a recall is possible, unless this is deemed a safety concern, I do not see Toyota addressing this issue. Please help.

From the onset of purchase of a 2013 Toyota Sienna xle, the air conditioner has emitted a foul odor that smells like mold. Nor will the a/c system adequately cool the vehicle until being driven sometimes as long as ten miles, if then. We have been told to turn off the a/c before arriving home to eliminate the odor and given a Toyota print out that this is a known problem that is specific to the 2013 Toyota Sienna. On the last scheduled maintenance freon was added but did not eliminate the odor or improved the a/c output. The foul odor never goes away while driving and may be an environmental hazard for persons with a lung or breathing condition. This is a totally unacceptable solution for the risk of being exposed to a potential dangerous and unknown noxious fume to the owner of the vehicle.