This smell is caused by mold and mildew build up in the AC air passages and on the heater and the AC evaporator cores in the dash, u can spray LYSOL mold and mildew remover into the system at the air intake in front of the windshield with the blower turned to max, use about 1/4 can, then turn off the system and let it sit for an hour, then turn it back on with full heat, let that run to dry out the chemical, this will cure the smell short term until the mold and mildew grow back, it is a fix we did often in the shop, the wetter the climate u live in the worse the problem
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