Lower left hand side if your facing the front of the car on our 01 & 02. From the driver's seat, it's on the right. And, yeah, don't remove it (or try to remove it) completely. A few turns and it'll flow pretty well. If possible, park (backwards, facing down) on an incline (driveway works well) and open the cap to aid in draining it completely. Then, when filling, reverse this, or better yet, put the front up on ramps - this will help avoid getting air trapped in the system.