Quote:
Originally Posted by leathermang
You still have not read the EPA guide have you ?
Those shops do not think the extra time and labor is worth doing..
WHY do you not address the physical properties and theory behind the Nitrogen being used testing for leaks under pressure....
and the fact that the R22 can be legally vented into the atmosphere after a test to find any leaks.... and lets throw in again.. the fact that a dye used for leak checking will not find a leak in the evaporator or in lots of other hard to see...
Perhaps you do not understand the concept of ' Aficionado ' ...
aficionado Definition in the Cambridge English Dictionary
Perhaps you would understand if I described working on your own MB AC system as ' A Labor Of Love'.... I think our members trying to do their own AC work on these old cars fall into that classification... so them knowing the physics of the situation is entirely proper.. if they choose to use lesser methods that is their decision... it is their car..
but this is not how those shops see the job....
Do you deny that on home HVAC systems the industry standard of ' triple evacuation '.. meaning using the nitrogen multiple times AS the method of extracting moisture is legit ? |
Please stay on topic: Why Auto AC shops do not use nitrogen/R22 pressure test.
I will call more shops next week in different states like Texas, California, Arizona, Florida and see if I can find a shop that use nitrogen/r22.
Vstech still has not answered my question on his statement:
"to properly test a refrigeration (A/C) system for leaks you need PRESSURE! it must be in the form of a gas. NO liquid can be present or it invalidates the test. "
Which makes the test pretty much useless unless it is a brand new system before oil charging, or the system has been disassembled and the old oil flushed out and the system reassembled.