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Instructions are in your owner's manual for the microfilter starting on page 8-23. If you don't have it, here's a link. http://www.nissan-techinfo.com/refgh0v/og/frontier/2003-Nissan-Frontier.pdf
As far as I know they all came with the slot and door for the filter, but not all trucks came equiped with the filter itself. Mine has never had one installed, so I plan on cleaning my coils with some cleaner like this. It's available at Home Depot for about $6.
Heath
As far as I know they all came with the slot and door for the filter, but not all trucks came equiped with the filter itself. Mine has never had one installed, so I plan on cleaning my coils with some cleaner like this. It's available at Home Depot for about $6.

Heath