HUGE REFRIGERANT LEAK STOPS 🛑 DURING ADDING REFRIGERANT. 100% gone after a few minutes of running

This type of leak that shuts itself off, and it only leaks precisely at exact temperature or pressure later on.
Eventually, it will leak and dump the refrigerant .
It might be one day one week one month
In a very few cases because I personally knew a few customers had this type of refrigerant leak actually last through the year .
You never know
But the one thing you do know, it will leak again 

[@traviswells1388]

Having worked in Heavy Equipment and Trucks for 29 years I've seen this many times. Video is a good reminder to younger technicians and others to think about under what circumstances o-rings and hoses see pressure. With how automated and dumbed down everything is these days I'm supprised the new machines don't use nitrogen and a variable pressure ramp to check for leaks.

[@coldfinger459sub0]

@@traviswells1388 that’s why I call them big dumb machine.
Push the button , it just works.
When it doesn’t? I don’t what to do

[@setoman1]

Soulless WRX with EyeSight Limited… 2016 by the looks of it. I used to drive one of these.

[@who_wantsit]

I appreciate you experimenting for us.😊

[@coldfinger459sub0]

@@who_wantsit it’s fun
And I always learn something new that I’ve never seen before .
Especially with all the newer vehicles that are controlled by software .
Different manufactures software controls differently.
And you can perform the same experiments on charging or discharging different amounts of refrigerant, and depending on the manufactures air conditioning algorithm controls to variable displacement, compressor, and the condenser fans .
Drastically different results
Then you’ll have the old fogies who say but air-conditioning is all the same, and it must follow the same rules and basic principles .
Not anymore
Because man has gotten involved with sensors and actuators variable displacement compressors, and fans, and has literally taken over control and force the system to operate differently .
All the old fogies who used to diagnose off of pressures are now outdated like old dinosaurs

[@who_wantsit]

@coldfinger459sub0 Man just has to have control all the time, can't leave anything alone.

[@coldfinger459sub0]

@@who_wantsit 👍

[@shanestrains2849]

I could be doing a blend door actuator on a subaru and it will get compressor o rings and expansion valve o rings. Always leak.

[@hnd2893]

All I work in is Subaru, I've seen this scenario dozens of times, they'll leak one minute and then stop. It happens during pressure and temperature transitions.
They'll bubble when you recover the refrigerant and the pressure starts to drop.
I hardly ever see the UV dye, just refrigerant leaks.
Also, the expansion valves, the plastic plug on the end, check there. If the plastic plugs is not flush with the surface of the expansion valve block, that's a place they leak very slowly.

[@coldfinger459sub0]

Yes, I have a lot of videos of a lot of Subarus with all those other leaks to.
Subaru is the king of AC leaks in the automotive industry

[@charlesphiliparthurgeorgep4653]

When observing pressures on a variable displacement compressor, would you have it running at max capacity (blower fan speed) or lower?

[@coldfinger459sub0]

@@charlesphiliparthurgeorgep4653 MAX capacity, windows and doors open Fresh Air mode blower on high speed.
But if it’s not hot enough outside, you’ll never max out the compressor to go to 100% duty cycle for full displacement

[@charlesphiliparthurgeorgep4653]

@@coldfinger459sub0 Perfect, thanks!