Nissan Micra 2003 1.2 Petrol Not Revving Up

Ok I have started to have problems with the car it has stop revving anything max rev is 2000RMP it does not go above that at all, I have changed the spark plugs and car battery since it was old. I have a close by car mechanic dealer says need to replace the whole AC unit near the key hole.

Any suggestion because I really doubt it is that!!!

I was looking at this youtube clip can this happen to my car because it's totally different car tho:
 
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