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This is a system which is driven by an amplifier and servomotors which open and close flaps depending on your settings. I think the air outlet servomotor may have failed . See here p58
HI, you can check with your local parts supplier ( Napa, Advance, Auto Zone, ect). There are numerous products out that help get rid of the musty moldy smell that happens in the A/C systems. These products are sprayed into the evaporator cases either through a small opening or a drilled hole. If this doesn't help that wonderful little mouse may have found his way into the case and not made it out and then you will have to the case removed and cleaned out. good luck
Assuming it's not a chemical smell, it sounds like a mouse crawled up in your heater and die or made a nest and the young died or you had a slight leak and it's molding. The reason you wouldn't smell it with the heat off is the duct is closed off completely when the heat is off. Unfortunately the only way I know to fix this is to pull the heater core and duct work and clean it out. If you do it yourself is quite a job. If you have a shop do it, it will be expensive.
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