I have a 1998 and 2004 Frontier. The AC works well in both. The 2004, seems to have a musty odor when I first turn on the AC to a much higher degree than the 1998 Frontier. Is there anything I can do to clean it up- such as change a filter, wash, clean something? Do I have to drop the dashboard or can I access through the engine firewall or from under the dash? Does anyone have any reference links?
Thanks Paul