Air Conditioner problems of the 2007 Lexus ES350

The contact owns a 2007 Lexus Es350. The contact stated that the air and heating system releases aluminum trihydrate through the vents. As a consequence he had to have surgery to stop his nose bleed. The vehicle was taken to the dealer, but the technicians have not been able to provide a remedy. He contacted the manufacturer to request a toxicity report. Upon contact a representative concluded that aluminum trihydrate is commonly used as an antacid, therefore there was not associated safety hazard. The failure mileage and current mileages were 15,000.