I quickly found while chasing all the myriad problems a/c and cooling systems bring is that it can be difficult to tell what the 2015 nissan silvia ac compressor problems are. You have to infer so much of it.
On the Ford, I found it very valuable to tie in some LEDs that showed when low and high fans were on and also, not just an a/c switch but one that clearly indicates whenever the clutch has engaged to supposedly be on. It became much easier to determine those hard-to-find things like PCM software strategies in various environments with all of those.
The 2015 nissan silvia ac compressor problems goes off at any throttle greater than like half, and the cooling drop during that few seconds, and if you pay attention, you will catch that. Normal and intended. And on older cars, the idle bumps that can almost stall cars are easily seen as the power surge needed to turn fans on. An AC too. You could easily watch the performance of the a/c system itself and know ahead of time when you were looking at a recharge.
I, too, would expect any ‘eco’ mode as shutting the a/c off more of the time. If it has ever been opened up or refilled, if any water got into the system, the water will freeze across your restriction there. The cooling stops, cargoes on a few minutes with warm a/c, then the ice plug melts and then back to cooling until water freezes there again.
I don’t know the clutch type on the front of the compressor, but if the magnetic type is like so many users, it can open up a critical air gap there. Then the clutch begins to not engage sometimes as the void has gotten too big and not enough magnetism over that distance to pull the clutch faceplate over to lock. The fix is often to simply reshim the clutch to closer, and then it usually goes back to working fine. But sometimes, you may need to replace the AC compressor too. A weak clutch coil can do the same thing.
An air conditioner on, clutch engaged compressor spinning, is it a V6 piston operated, feel the output large compressor hose, should be cold. That enters the evaporator, which is the heat exchanger feeding cold air in the cab. So the return line should be a bit warmer than the input line.
Feel these lines in am when cool, then again when in pm being warmer ambient. Are they the same or different in temperature? Ambient does make some difference, but when the freon changes state, it does so when compressed. There is a plate within the 2015 nissan silvia ac compressor to vary the compressor’s rate of change. If stuck, that compressor may only be able to discharge at the lower end.
Other than taking it apart and looking, you can try dislodging the compressor’s swashplate by giving it a good solid thud with a weighted hammer, but choose an area of the compressor that will do the best in vibration without breaking. It is a very iffy thing to do and should be done while the compressor is operating.
Suppose a V6 compressor is also expensive. Also, if you have a drier installed, that drier may be saturated or plugging. Even the front-mounted condenser can be clogged. Feel the heat exchangers, both the internal evaporator and the front-mounted condenser.
The evaporator under regular use is cold 40F to 55F, while the condenser is hot as it removes cabin heat. To compare them, feel around the drier, while all this system operates liquid to gas to liquid transformation is taking place can you hear this, use a stethoscope on pipes and heat exchangers.
Nissan silvia ac compressor are pretty much cool, or they don’t. There is no in-between, it either works good, or it’s torn up. Unless, of course, it is one of the late ones that have variable output, I haven’t played with one of those yet, but simply by the description of how they work alone, it should be able to cool than not cool erratically. Cooling/not cooling is often an overhead (control system) issue.
I will likely be putting some of those indicators on my 2015 nissan silvia as well. They proved to be dead cheap and quite valuable. So many people have utter fits trying to figure out the a/c and cooling systems, which are almost the same now. This is because they are so hardwired into each other. Those lights help; at least they did me. I do all of my Nissan car work, and no dealer has ever touched my cars for 45+ years now.