OK!! I got an RX7!!! Best day, wait... THE BEST DAY!! OF MY LIFE!! Okay, anyways when I opened the hood, on the left fender side with the screws was this blue cap with the letter "L" on it. What is it, and where does it go? All help is appreciated!

 

WOE! WOE! WOE! These pics are too BIG!!
sorry people upstairs

 

Oh yeah, its a 1987 Mazda rx7 GXL non-turbo.

 

it looks like the cap that goes on the A/C lines. look to see if one is missing.

 

This. Low pressure AC line. It'll only fit on one fitting (Low versus High), and it's not entirely necessary anyways.

 

Ok thanks, ill go snap it back on.