Complete replacement would only means black oil issue. If really is black oil then yes. The only way to fix is to replace whole AC system. You cannot replace part by part as the black oil is like a virus. As long as the virus remain in the system, it will continue to spread to other system if you only replace one part.

Price is about right at around 2k depending on parts you get. Used, oem, ori and so on.

Most workshops will recommend changing to more power compressor (Alza) but you should stick with original or oem myvi compressor. Bigger compressor will means higher FC and more work for the engine.

Good luck.

Also to note, myvi first gen (aka old myvi) is notorious for black oil issue. The reason is still unknown but usually cause didn't go through proper service intervals.

Be also very careful and ask the pomen proper questions. A lot of AC workshops will say to just change one part and save cost. I am not sure whether they don't know about black oil issue or just want you to keep going back to them for business. Regardless what they say, to be safe I would recommend to change complete system. Unless the pomen can confirm it's not black oil and will warranty on the fix. Cause if really black oil, changing only 1 part will solve the issue only for few months.

What your mechanic means when not doing flushing only is just servicing the AC by changing the oil and gas. No changing of parts. When you change parts, you will need to refill the oil and gas. Not really flushing but adding. Still costs involved in terms of that.

As for changing complete set of AC, it really depends on the communications. Some pomen will mean changing EVERYTHING but some only means changing few parts only. This really need to be listed out properly and agreed on before work commence. Things like expansion valves and drier filter are parts that must be changed and sometimes not communicated but then suddenly kena charged. For black oil, you can either change the pipings or chemical wash them. Still something extra.

Yes, that is chemical wash of the pipes and things didn't change.

Strange didn't show listing of expansion valve and filter drier. Maybe the pomen lump into other parts.

Also how come cooling coil didn't change? Lazy to change cause it's too much work? The issue will come back in less than 1 year. My car didn't fix properly and the AC issue already start showing. But it's already 2 years. Now using until it not cold anymore. Then change whole set.

If you have been servicing the car in SC for the first 3 years (due to warranty), the AC service is included in their schedule. AC service usually includes changing oil. This is when they plug the flushing machine into the AC and let it run for an hour. Check back your receipts.

If you don't mind paying more, just send the car to SC for all services. If anything is spoil, let them tell you what is the problem and then fix it outside workshop (cheaper). I have been doing this for my previous car (Honda City) and the car was in immaculate condition (engine, gearbox, ac) when I sold it on the 8th year.