2 random questions

ok useless question: this guy i know has a 97 camaro i belive, and i noticed it makes the same "whizzing" type sound that comes from the back of the car whenever the engine is running and when you first turn they key before starting the engine. im sure you all know what im talking about and i was just curious what this was. second question was since my AC is blowing warm on both sides now i want to start troubleshooting first by putting in more freon to see its a leak, but i was snooping around under the hood and it looks like theres two openings for the freon? one by the air intake filter and another by the brake fluid? am i looking in the right spots? if anyone has a pic of where the freon goes or any advice too that would be helpful, thanks again! by the way the kind our cars take now-a-days is R-132 right? i know R-12 is the old kind.

My 2 cents worth. First the new kind is R-134a and it is put in on the low pressure side. Usually if the freon is low the compressor will cycle off and on very quickly or not at all. You can buy a kit at the auto parts place with a hose and a gauge that is color coded. It should only fit on the low pressure side. For DIY that is where I would start.

yeah thats what i meant R-134a i knew it was something like that. how would i know/tell if the compressor shuts off and on?

The hose in the kit will only fit the low pressure port (which is near the firewall). The whiring you describe sounds like the electric fule pump which is located in the fuel tank, or the canister purge valve, which is also located near the trunk.

how would i know/tell if the compressor shuts off and on?

You'll see the load on the tach. RPMs will vary and you will hear the A/C clutch engage and disengage. It will make a clicking sound. If your A/C is blowing warm then you are probably so low on refrigerant that the clutch will not be engaging because of the low/hi pressure cutout switch located by the accumulator. Have fun and good luck!

BTW- Take A/C on and then off, etc. to cycle clutch.

This is the hose and gauge I use. It came from Advance. According to the gauge, about 45 lbs. is the upper limit.
http://i81.photobucket.com/albums/j203/wlkjr/DSC01451.jpg

The low pressure port is the smaller of the two ports, located up top to the left of the trans. fluid dipstick, dust cover removed for clarity. The high pressure port is under the brake master cylinder and should not be used.

http://i81.photobucket.com/albums/j203/wlkjr/DSC01453.jpg

Some cans of freon say not to turn them upside down, but my cousin who does a/c work says that was for R12 and won't hurt in the R134a system. When I did my gf Jimmy I didn't have luck until I turned the can upside down.
Two cans did the trick for me.

Well thank you all very much once again and for the pics too, now that you mention it i belive i do recall the compressor clutch making clicking sounds even before the air went completely warm. ill recharge it and if it gets warm again then it must be a leak somewhere. thanks again! :)

ok so me and a friend put in the freon today and all went well, it took the whole can of it to get the pressure right up to about 45 where it should be, the ac is cold once again but i saw the can says it has some kind of leak stopper? how effective is that? also the air IS cold on both sides but i can feel KIND OF somewhat of a difference on the drivers and passenger sides, should i put a little more in or would i risk doing any damage or injury exceeding the pressure of 45? or would adding in more not do anything at all in making it colder? i just want to get both sides even, but i think its pretty close to even, just wanted to know if thees anyhting else i should do to get it perfect. if not im happy with the way it is anyway. as long as it stays cold

I'd doubt that the leak stopper will have much effect, at least it hasn't for me. You will probably have to add a can every year unless your leak is significant at which point you would want to have it repaired professionally. I wouldn't add any more if it is up to 45.

yeah im gonna see how long it lasts, if it doesnt last too long ill have it checked for leaks and have the hose(s) replaced then