Necessity is a real mother. The A/C compressor seized up and burnt a couple belts this winter in my '02 KIA (236,000 miles). I have a replacement on its way (with the drier-receiver). The shop wants $115 to evacuate my system and $300+ to evacuate and recharge, with me replacing the compressor et al. I am in Indiana, so releasing R-134a is not illegal, but I would like to capture it instead of contributing to global warming (the 26 ounces of R-134a in the system would have the same GWP as burning about 310 gallons of gas to drive 9600 miles). Has anyone ever heard of either (1) using dry ice on the condenser or (2) connecting the low- or high-pressure connector to a canister packed in a cooler of dry ice, in order to keep the R-134a liquid and lower the system pressure to reduce leakage? What is the vapor pressure of R-134a at 70-80 F? I assume it would be below ambient when chilled to near -100 F. The pressure could indicate what type of vessel would work as a cold-trap reservoir.
It wont work because whenever you open the system it is going to turn back into gas form. As far as using dry ice is a new one on me I have been doing this a long time and I have never heard of that but who knows it may work. If I were you I would call around to a few different places 115 dollars just to evacuate the system is a little steep when you call just ask them how much they charge to just to evacuate the system and how much they charge to recharge it don't tell them what you have in mind as far as the 300 dollars to recharge it is way to much I only charge at the most a 100 dollars to recharge a system
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