Air Conditioning unit

Hi All

I am trying to locate my air compressor on my engine, as you might be able to tell, I have no idea, I purchased a refill can at Pep boys and I am now trying to fix myself and do not want to put in the wrong place. I went on to Ford.com for a picture by they do not provide you with any . Any one help?

Thanks

Provide a digital picture of the engine compartment area of your car. It's very difficult to tell you what to look for if we don't have a clue about the type of car you have.