The contact owns a 2020 Toyota Rav4. The contact stated that the mirror housings of the vehicle were melting. The dealer was made aware of the failure and informed the contact that they could not assist as the failure was a manufacturer defect. The dealer referred the contact to the manufacturer. The manufacturer was notified of the failure advised the contact that they would follow up with the dealer. A case was opened. The contact stated the dealer took photographs of the failure. The contact stated the manufacturer contacted her and informed her that their field experts determined that the failure was not a manufacturer defect but an environmental issue called solar conversion. The vehicle was not repaired. The approximate failure mileage was 10,000