How do you replace a cam position sensor on a 2001 Chevrolet 2500HD pickup?
If it has one, it would be inside the distributor, so the distributor would have to be removed and rebuilt, or replaced. Check the warranty first on your vehicle.
The cabin air filter on a 2003 Chevy 2500HD pickup is located on the passenger side under the glove compartment. To replace it, first remove the two screws on the kick plate under the glove compartment. Remove the kick plate. Then, unclip and swing the filter housing cover to the right. Remove the filter by pulling straight down. Insert the new filter, and reassemble in the reverse manner.