If Your Talking About The Musty Odor When Turning On The Ac..its Moisture\mold That Has Form In The Evaporator Housing In The Dashboard....the Previous Campaigns For The Wynns Airco Cleaning System Have Been Discontinued And There Is A New Campaign Available That Should Eliminate This Odor, In Any Case If It Doesnt They Should Replace The Evaporator Housing If The Odor Is Not Diminished.