strykernyc

my car now is making some annoying noise once again and the mechanic said it has to do with the ac and is just the beginning of problems that will happen with the ac, the noise would only come when i step on the gas but now even without pressing the gas i can hear the noise little, btw this does not happen when on park or N. my question is what does the ac has to do with me steping on the gas and making this loud annoying noise? sounds like a sound a belt makes. ... and what is the yellow thing i can see inside from where the ac air comesout? see pic