 [ Symptoms ] i have asthma and when driving in a car with the heat on i can barely breathe any idea on how to cope with this  for over 2 3 years now i have had trouble managing my asthma while driving in the car i can not have the heat on wo having trouble breathing i use the heat with the ac controller on which i think helps dehumidify the airnot 100 on that the only thing i can really do is crack the window to let some heat out so i can breathe the colder air this happens in the winter obviously when the heat is needed the biggest problem is when other people ride with me i can not have them getting cold [ Disease ] hi try this forget the ac you can either have recycled air or fresh just keep it to fresh air that is heated up this should work for you good luck