* If your truck has air conditioning: The cabin air filter is typically located behind the glove box. You'll likely need to remove the glove box (usually involves unscrewing it or releasing clips) to access it.
* If your truck does *not* have air conditioning: Your truck likely does not have a cabin air filter. This was a common feature omission on trucks without AC in that era.
Before you start: It's always a good idea to consult your owner's manual. It will have the most accurate information specific to your truck's trim level and options. A quick online search for "2001 Dodge Ram 2500 cabin air filter replacement" along with your specific trim level (e.g., "2001 Dodge Ram 2500 SLT cabin air filter replacement") might also yield helpful videos or diagrams.
