Which is why if your system happens to get a leak you just convert it to 134A and call it a day.
didnt know that.. can you add 1234 to 134 or have vacuum?
Your question is if you can add R-1234yc to a system with R-134A refrigerant? The answer is "no" since the EPA does not allow mixing refrigerants. All refrigerant must first be recovered by an approved shop tool. Oils must be changed if required. You then evacuate the system before adding the new refrigerant. Of course if all your refrigerant leaked out, there is nothing to recover.
Was curious so checked just now. My cost right now is twelve 12once cans of 134a is $99.99 delivered
Where are you getting that r1234yf (idk where you're getting the c from ether) operates at a "much higher pressure"? It is true that r1234yf is more flammable than r134a.
It has to be a dead empty system. Don't go mixing refrigerants. There are conversion valves for sale as r1234yf take a different hook up. NOW.... converting is no way endorsed by any OEM or EPA BUT does it work... yes.
Strange since one adds refrigerant at the low-side port. If you didn't have a gage attached to the high-side port, perhaps the Schrader valve had been stuck open and the oil flowing thru it lubricated it enough to close again. If you had left the system with no pressure for a long time, atmospheric moisture can get inside which is absorbed in PAG oil to form corrosive oils. Some people then fill with a HC refrigerant, find a leak in corroded metal, like an aluminum condenser and blame the refrigerant. That would have happened with any refrigerant which pressurizes the system.
