Hey. I got a used BMW 328i and the guy told me it has no freon, so summer is coming up. And i want freon in the compressor. How do i charge freon on my car? i have never done it before. and please don't tell me that i am not certified, i know that.

I have the E46, if that matters.
Thanks for your help.
I looked everywhere under the hood, found 2 intakes, i have no idea which one is low pressure, and which one is high. they are different sizes. and none have any caps on. or strikers of any sort.