What kind of odor? Oil smell, musty stale air smell, mold? Can you pinpoint where it is coming from or just all over? Maybe the A/C drain is plugged and you've got an odor from the heat assembly. Need more information.
Cabin or air filter? Cabin filters should be changed every 15K, Air filters a little more.
i usually put pine sol or the equivalent down the vent area at the firewall with the fan on full getting outside air. u need to clean out the mold.
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