Can You Use R-134A in a R-1234yf System? Let’s Find Out!

In this entertaining experiment, we test whether you can use the older R-134A refrigerant in place of the newer R-1234yf in my 2018 Honda Civic Si! After a front-end collision left the AC system empty, I decided to recharge it with R-134A instead of the more expensive R-1234yf. But does it work, or is this just a recipe for disaster? Join me as I dress up like a scientist, dive into refrigeration theory, and break down why this idea might make sense—complete with whiteboard drawings, TP charts, and lots of laughs! Spoiler alert: We’re here for fun, not to reinvent air conditioning standards. ⚠️ Disclaimer: This video is for entertainment purposes only. Don’t try this at home unless you want to void warranties and break the law. Mixing refrigerants is a bad idea for safety and environmental reasons