To access it, you'll likely need to:
1. Remove the glove box: This usually involves removing a few screws or clips holding it in place. Consult your owner's manual for specific instructions.
2. Locate the filter: Once the glove box is out, you should see the cabin air filter behind the opening. It might be in a housing or simply nestled in place.
If you can't find it after removing the glove box, it's possible your truck doesn't have a cabin air filter. Many vehicles of that era didn't come standard with them. Check your owner's manual to confirm whether one was installed in your specific model. If it's not listed, it's likely not present.