Jupiternaus

I first purchassed my car while meployeed @ Autonation in Irving, when it was still Autonation @ 82000 mi. Now it is 3 years later, been payed off for over 6 mo's now... and @ 170000mi. I love my babey, however I have to tell myself the noises are mood swiungs my catr has..because itll drive like crap one time, then like a doll the next - to date I have replaced Transmission (about 7000 mi ago), that was the biggie..however I got a steall-had a friend o family rebuild for only 1,100. I have a question. actually 2.

One - my A/C ok - on settings 1, 2, and 3 - nothing..on four..it blasts out - like normal. and it blast out non-cold air... but when I switch the a/c button on I feel it kick in slightly... (just replaced all four motor mounts so I don't feel much anymore) So Do I just need Freon? if so is there a leak? or could it be dried up from 11 years of use?? then a guy told me a switch in car goes out that causes settings 1-2-and 3 to not work..is this ture? whats the part called? can i replace myself?

Second question... what all recalls have ther been on the 90 max? and where can I go to get them? Courtesy Nissan perhaps? I heard somewhere over 40 were palced...how to check if my car was included?

thanks

happy trails