How do you change air filter on 99 ply voy. 3.0 engine

The filter is located down low under the air box which connects to the throttle body. You'll need to remove the fresh air inlet line from the throttle body (loosen hose clamp) there are two (2) large phillips head screws which hold the air box in place , remove these there may too be a clamp which connects the air bos to the filter box, if there loosen and slide away the air box. On the filter box there are two (2) clamps that hold the filter in, snap back these claps to access the filter and replace. To install reverse the above.

I hope this may have assisted you,
Tom