Mine is working, just not very well. I added some 134, but who knows what was in there before hand. I want to empty it, replace the receiver dryer and use some more 134. I may do as you did and see what I find before opening it up.
I've seen where guys pressurize them to 200 psi. Seems like a lot to me.
Quote:
Originally Posted by Tim Hancock
I just pressurized my 911SC yesterday to find a slow leak.
I got my old stock AC working and switched to 134 about 4-5 years ago on my SC by pressurizing the system with air and then spraying everything with soapy water (I simply dump about an ounce of dish soap in a spray bottle filled wih water) to find the leak (AC line by the jack port was damaged by the PO and was the source of the leak). I fixed the leaking hose, then installed a new drier then evacuated the system with a vacuum pump prior to charging with some oil and 134. It has worked great for the past several years needing only a can of 134 each spring. This spring it no longer worked and after hooking my gages up it read only 10psi prior to running so I knew I had a leak to fix again. Isprayed everything down and found no visible bubbling leaks so I reluctantly pressurized with compressed air to about 40psi..... still no visible leaks..... I pressurized to 70 psi and resprayed eveything and low and behold my 4-5 year old drier had a leak that showed up by bubbling the soapy water solution.
I just bought a new drier and after installing, I will put the vacuum pump on it for a couple hours then recharge with 134 just like I did 4-5 years ago and all will be well again.
While pressuring with air seems like bad idea, if you have a system that completely leaked out, it will have been exposed to air anyhow. So long as you vacuum the system for a long time to boil off the moisture, it will be fine. I am fairly confident I would not have found this latest leak using only the -14 psi that a vacuum produces.
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