Two: one engine air filter and one cabin air filter. This count holds across the 2020 Ram lineup, including the Ram 1500 and the heavy‑duty 2500/3500, regardless of engine choice (gas or diesel).
What are the two filters?
The engine air filter cleans the air entering the engine for combustion, while the cabin air filter purifies air circulating inside the vehicle through the heating, ventilation and air conditioning (HVAC) system.
Where to find them
Engine air filter
The engine air filter is located inside an air intake box in the engine bay, typically on the driver's side. Access usually requires removing a lid or clips.
Cabin air filter
The cabin air filter sits in the HVAC housing, commonly behind the glove box or under the dash, depending on trim level. Access typically involves removing the glove box or a panel.
Replacement considerations
Replacement intervals depend on driving conditions and maintenance. Many owners inspect the engine air filter around 12,000 miles and replace within 15,000–30,000 miles, while the cabin filter is often replaced every 15,000–25,000 miles or annually. Dusty or off-road use can shorten those intervals.
Summary
In short, a 2020 Ram has two air filters: one engine air filter and one cabin air filter. Regular inspection and timely replacement help maintain engine performance and interior air quality.