Engine Size: 194
Refrigerant Type: r12
Ambient Temp: 90
Country of Origin: United States
Hi all, new to auto AC and the forum and had a few questions.
I installed a newly conditioned dryer receiver, a6 compressor, and condenser on a 63 nova and did a vac test.
The vac pump pulled down to just 25 after 2 hours and when I closed the manifold it dropped to 0 within 30 min.
I kept tightening and rechecking the system and doing this at least 4 times or more and the same results.
So I figured the only way to check the leak was to pressurize with the nitrogen that I purchased.
After doing a last vac and quicly switching to nitrogen I pressurized and didnt hear any thing that was obvious so I soap bubble tested every connection, hose, fitting, pipe and no bubbles but the pressure kept dropping.
I then soap bubbled the AC manifold and the low pressure knob was defective and was leaking from behind the knob.
So knowing that the manifold was defective I bought another AC manifold and the first vac test pulled to 30 and held just fine for over a day.
I then pressurized with nitrogen at 100 and it held at that for over 2 days.
I assume that all is well and I can now charge with the R12 I have but wondered...
Would testing a system like that 4 or 5 times and the gauges going to zero cause the newly rebuilt receiver dryer to be bad?
I live in south Georgia and its humid but the car has been in a garage with ac and a dehumidifier working most of the time.
what is the best way to disconnect the manifold hoses from the shrader valves on the compressor without the quick burst of pressure leakage?
I don't think you have contaminated your dryer by introducing dry nitrogen. As far as the old R12 Schrader valves; just got to be quick.
Thanks Hecat for the reply.
The main concern on the dryer I had was due to the vac tests that went to 0 four to five times and any outside air that was then pulled in each time it all leaked out from the defective manifold.
At this point I am going to learn now how to charge this 1963 ac system with r12 and hope it get it right cause this stuff aint cheap or healthy.
I think you have done a good and thorough job to ensure the system is tight and ready to charge with that expensive R12. I would not worry about the health issue; I worked with that stuff for years, and I only twitch every once in while.
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