Another dumb question

[Wildcard]

(06-17-2021 )Nilao Wrote:  With a vacuum gauge that reads in microns. But in an automotive system I wouldn't concern myself with getting a perfect vacuum. That's more for commercial HVAC that might be sealed for a decade or more. Most automotive AC systems are going to be opened every few years for some reason or another.

They shouldn't. And I disagree. Be it Refrigeration, home A/C, Industrial A/C, transport refrigeration or the A/C system on your KW/Pete or Volvo a refrigerant circuit is the same.

Moisture left in the system is 1- non condensible causes poor performance. 2- turns oil to sludge and acid, causes txv's, orphises and small passages to clog. 3- causes copper plating which equal poor heat transfer.

Why would you open the circuit on your truck every few years? Unless the compressor has to be unbolted there is no need.