A/C Issues, Weird Knocking Sounds

[evo-lution23]

Ok guys, I need your help ... I wasn't having any issues, aside from not having ice cold air in my opinion, so I decided to use some of that "A/C Pro" stuff and it seemed to work just fine. I ran it through the system and recharged it as instructed. My car sat for a day or so over the weekend when I got in it today and turned on the A/C it made a weird almost knocking noise. Of course when I popped the hood to look the noise went away. Everything seemed to be functioning correctly and sounded fine after running for a few minutes, but when I started driving the noise still comes & goes. I can even feel the car being slowed down while running the A/C. When I'm cruising I feel the car slow down very slightly, as if I applied the breaks just a bit, then that goes away and it cruises as it should, slowing down on it's own, weird ... idk what to do ...take it in?

03 VIII btw, just reached 100k miles.

[kambodianboi]

One does not simply have a working AC in the EVO. lol

Using the AC does reduce overall performance of the EVO, sometime causing it to stall (multiple scenarios). You should do a leak test on your AC system. Even if your AC system seems to work, it could be leaking, meaning no FREON, meaning no ice cold air. Yet the compressor still runs, which draws power from the car performance, yada yada.

[boobooevo]

Or remove it and save yourself 30lbs, just need a RS Belt to replace.

[LakerFan]

I would buy those self refill and install myself always had some issues my nephew informed (works as a tech at nissan) that those don't work since u never drain the system and fully recharge it properly