Another dumb question

[Nilao]

The thermistors always go out of range. Last time I replaced them one was reading ambient the other insisted the temperature of the suction line was 297 degrees with the system off and at ambient.

The thermistor problem was the reason they went back to simple pressure switches after the 2011 model years.

I always vacuum my system with a professional AC machine with a dual stage vacuum pump. I can get it pretty close to absolute vacuum but when you're expected to complete a service within 2 hours you can only vacuum the system for so long. I know in the commercial HVAC world you guys get the luxury of leaving your system on vacuum while you go off to another job but when you only have 1 machine and 20 trucks needing to use it your time is severely limited. You just do the best vacuum you can, ensure it holds whatever it stabilized at, charge it and send it.