get in front of the vehicle, facing the radiator. over on YOUR left (passenger side) of radiator, reach down and fumble around the lower corner of the radiator with your right hand. it is near the corner, just a little bit up from the bottom, and faces towards the rear of the vehicle. you'll find it. be careful if it's hot that you don't burn yourself.

Don't try to get it from the bottom, you WILL get coolant in your eye no matter what you do. it's got supernatural powers with that