With the HP in the 260's at around 31C (88F) ambient, I don't think it's the compressor. Chances are that the high side would be much lower if the compressor was getting weak.

For a 27C (81F) ambient, the pressures look pretty good to me. Bear in mind that the pressures will vary depending on engine and vehicle speed and hence airflow through the condenser, compressor efficiency, ambient temperature, and so on. Your 1997 Sentra has a thermistor to prevent the evaporator f...

The outer caps do the actual sealing, not the Shraders, which can leak a little bit normally. So don't be overly concerned about them. Ensure that the caps are on good and snug and that the internal seals are okay, and you should be fine. If you have doubts, just replace the caps with new ones.

@cusser. Yeah, his thermometer broke days before i brought the car. Ive been testing the car since the evaporator was replaced with the "good used original". All has been good so far. Only the air feels very humid every time the compressor cycles. Probably due to the humid weather here. G...

I had the guy hook the gauges again to check the pressures: ambient temp was about 35 degrees celsius and very humid, the pressures with car at idle and fan at max speed are 220 psi high and 30 psi low. The pressures are a bit lower now. These pressures look good for a 35C (95F) ambient. If the com...

The thermistor seems to check out okay then. Whether the condenser is causing the compressor cycling problem, as the second tech theorizes, I don't know. One thing's for sure, though, the high-side pressure is too high. At 28C (83F) ambient, the high side should be around 200 PSI, not the 260-270 PS...

Regardless of whether the compressor is the variable-displacement or fixed-displacement type, in this car it has a clutch, which de-energizes or remains energized when it shouldn't. The question is, why does it do that? We know that the compressor clutch is getting voltage. But then the voltage turn...

There are no mufflers in any of the lines. The compressor was also removed from the car and was drained of all oil. And yes, the oil the tech used is PAG-100. The tech also tried jumping the high pressure switch thinking it might be defective but there was no change. The compressor would still turn...

Very good. Enjoy your holiday.

I forgot to mention that the receiver/dryer and compressor should not be flushed, either.