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It does not have an antifreeze or burn smell. Is it possible to get mold or mildew in heat vents and duct? Would this be easy to check and rectify?
ANSWER: Hi yes mold or mildew can form on the Air Conditioner evaporator or in the AC evaporator box in your motorhomes chassis cabin heater/AC system. You will be able to smell this musty smell when using the cab heating system.
Based on your description I cannot guarantee that what you are smelling is from Mold or Mildew. Here are a couple of things I would check before I started attacking the AC Evaporator. Depending on the year of your motorhome the Heating/AC system on your motorhomes chassis may have a cabin air filter. You should check this filter and change it as needed.
Another thing to check is the drain hose on your AC Evaporators box. There should be a small drain hose on the box that allows the water created by the evaporator to drain on the ground. If this hose is blocked the evaporator box will retain the water and create a great environment for Mold and Mildew growth. Obviously, you are going to have to climb under the engine compartment of your Motorhome to locate the evaporator box drain hose to make sure that it is not blocked.
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