Starting this summer our 2013 toyota highlander was having a terrible odor coming from the ac. went to dealer and was told they would clean out the ac/ evaporator box with ammonia and then put a mint spray to reduce ammonia smell. paid $65 for this service. on way home i smell nothing but a stale odor. the next day the moldy smell was back. didn't even have to start car. the second i opened door it hit me. i went on google and saw a number of people were having same problem with toyota cars. not just a highlander!! the avalon,camry and others are having this same issue. the problem appears to be mold in the evaporator box and vents. have had many vehicles and never a problem like this one. bought the car new and for toyota not to admit to a bad design is disappointing.