You either have a heater core issue or what is real common an all cars is you may have a mold issue on the AC evaporator that is burried in the dash ductwork. If this is the case all manufactures have a cleaning process that requires partial disassembly to allow a spray wond to spray a mold killer into the problem area.
Usualy this problem happens because you keep your AC on automatic mode or you always run you AC and never give you vents time to dry out.
If the smell can be desribed as say a locker room type smell then this will be your problem. If it is a mold issue it can cause health issues if your suseptable,
If the smell is sweet and your loosing coolant then it will be a heater core issue
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