We frequently have a musty or nest smell when using the blower
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2006 Ford Explorer Question: Does it have a cabin filter?
Answer #1Bret Bodas from RepairPal Test Shop, March 31, 2010, 11:37Master
This vehicle doesn't have a cabin filter. This smell is generally from bacteria growing on the A/C evaporator. You'll want to make sure the evaporator drain is clear otherwise water will collect in the evaporator housing, causing this odor. There are some sprays that help to disinfect the system to alleviate the smell. Try to find a good A/C repair shop, they will be well equipped to seal with this issue.
You may find one here: