2012 Freightliner Cascadia AC compressor seal Leak

Hello everyone,

We have a 2012 Freightliner Cascadia. DD15 engine, last 8 vin is CSBE1267. There is refrigerant leaking from the spot I circled in the picture(from a random website) even we changed the compressor and the seal inside the hose connecting to the compressor twice. I don't understand what else could be wrong. Does anybody have the part number for the oring inside. I want to make sure I put right one in. And torque spec? I also attached a youtube video of replacing the AC compressor so you guys can see the oring inside. But seriously, I am so frustrated because it has run out 3 times and it probably would not last few more days until it breaks again. Any thoughts?

Thank you!

Video picture(I don't know why I can't browse youtube now, so I just did a screen shot, and it is the first video)

 

Probably that is the case, it is still leaking, but not a lot.

 

All of these works? or I should use the newest number(the 427 one)? And do you know the part number of the hose? thank you!

 

Here is a new photo of the leak, you can see the green place from the bottom tube.

 

The mechanic installed for us, I did not see that he used pag oil. Will double check with him. Thank you!

 

Wait a second, when you install ac compressor, do you also need to feed them with pag oil? or it contains the oil it self. Because I did not see the mechanic add any oil to the system, all he add is the refrigerant.