To know for sure if yours has one, and where it might be located if it does, you should:
* Check your owner's manual: This is the most reliable source. It will tell you if your specific trim level and options included a cabin air filter and where it's located.
* Consult a Dodge Dakota repair manual specific to the year and model: These manuals often include diagrams showing the filter location.
* Search online forums: Search for "2003 Dodge Dakota cabin air filter location" on forums dedicated to Dodge vehicles. Owners might have posted pictures or descriptions of the location if theirs had one.
If you find no evidence of a cabin air filter, then your truck likely wasn't equipped with one from the factory. Adding one would require professional installation and modification.