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

DIY R1234yf Conversion To R134a How To Recharge AC Refrigerant On 10th Gen Honda Civic AC Fix Part 2
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DIY R1234yf Conversion To R134a How To Recharge AC Refrigerant On 10th Gen Honda Civic AC Fix Part 2

Comparison of R134a vs R1234YF. Analysis of both
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Comparison of R134a vs R1234YF. Analysis of both

How Dangerous is Fake Car A/C Refrigerant? Let's Find Out!
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How Dangerous is Fake Car A/C Refrigerant? Let's Find Out!

SCRS Quick Tip: Differences between R-1234yf and R-134a
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SCRS Quick Tip: Differences between R-1234yf and R-134a

Don’t put R134a Refrigerant in an R1234yf System—  This is what Happens (Big Mistake)
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Don’t put R134a Refrigerant in an R1234yf System— This is what Happens (Big Mistake)

How to Recover, Vacuum, & Charge Automotive R134a R1234yf AC System at Home (Every Step A-Z!)
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How to Recover, Vacuum, & Charge Automotive R134a R1234yf AC System at Home (Every Step A-Z!)

CAN YOU USE R134A FREON REFRIGERANT INSTEAD OF R1234YF ON JEEP CHRYSLER DODGE
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CAN YOU USE R134A FREON REFRIGERANT INSTEAD OF R1234YF ON JEEP CHRYSLER DODGE

CAN YOU USE R134a in R1234YF AC SYSTEM
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CAN YOU USE R134a in R1234YF AC SYSTEM

R-1234yf vs R-134a Fittings Adapters, Charging Hose & AC Refrigerant Canisters, Are They Compatible?
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R-1234yf vs R-134a Fittings Adapters, Charging Hose & AC Refrigerant Canisters, Are They Compatible?

I can't believe Mechanics don't know How to Recharge AC system correctly!
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I can't believe Mechanics don't know How to Recharge AC system correctly!

How to charge a R1234YF air conditioning system for under $100 DIY
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How to charge a R1234YF air conditioning system for under $100 DIY

Can You DIY Service R-1234yf AC Systems?
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Can You DIY Service R-1234yf AC Systems?

READING AIR CONDITIONING PRESSURE GAUGES/HOW TO KNOW WHAT THE FAULT IS/AIR CONDITIONING
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READING AIR CONDITIONING PRESSURE GAUGES/HOW TO KNOW WHAT THE FAULT IS/AIR CONDITIONING

Fill a leaky air conditioning system with R1234yf yourself
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Fill a leaky air conditioning system with R1234yf yourself

Difference between r134 and 1234yf  AND can you use r134a in r1234yf ac system?
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Difference between r134 and 1234yf AND can you use r134a in r1234yf ac system?

R1234YF TO R134A FREON ADAPTER, HOW TO USE IT
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R1234YF TO R134A FREON ADAPTER, HOW TO USE IT

OMT R-1234yf 4-Port AC Manifold Gauge Kit Review (Honda Clarity AC Recharge)
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OMT R-1234yf 4-Port AC Manifold Gauge Kit Review (Honda Clarity AC Recharge)

Recovery of 1234YF AC system with home made machine
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Recovery of 1234YF AC system with home made machine

This $3 Can Will Make Your Car’s AC Blow Sub Zero When It's Hot Outside
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This $3 Can Will Make Your Car’s AC Blow Sub Zero When It's Hot Outside

How to Properly Recharge Your AC System
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How to Properly Recharge Your AC System