> Pulling the A/C unit out to lighten the car for the dragstrip. Why bother renting an A/C reclaiming machine when I can just open the valve and let it vent? T

> Pulling the A/C unit out to lighten the car for the dragstrip. Why bother renting an A/C reclaiming machine when I can just open the valve and let it vent? This is very rare in the grand scheme of things and the most common case is simply to recharge a line that had a slow leak. Both the valve that allows you inject coolant on the A/C system and the valve on the pressurized can are one-way by default. Yes, a little get leaked every time you do this because there is a void between where the valve attaches to the pressurized can, but this is all about trade offs. If your A/C is leaking, you can usually fix it as it’s usually just a brittle gasket or a flare connection became loose over time. Most people I’ve helped have vacuumed out their refrigerant before disassembling so they can simply pump it back in. Why pay for new coolant if you can borrow the vacuum tool for free and just use what you got already? Yes, I’m sure some people just open the valve and let it rip, but most undertaking this repair at least watch a few YouTube videos.