The fundamentals of AC diagnostics haven't changed with R-1234yf, but the service process has — and that's where shops keep losing time. The most expensive mistake: introducing contaminated refrigerant into the system, which can spread to the recovery machine, internal tanks and every job after.
Refrigerant identification catches this before it happens, but only if you know what triggers a failed reading. Sampling issues, sensor degradation and actual contamination all look similar on-screen but require different fixes.
It also helps to drop the myths still circulating in shops — that R-1234yf doesn't cool as well as R-134a or that it's basically propane. Neither holds up. Clear procedures, not assumptions, are what prevent comebacks.
Watch this Tech Tip for the full breakdown of what's actually going wrong.
About the Author
Erik ScreedenErik Screeden
Technical and Multimedia Content Director
Erik Screeden is the Technical and Multimedia Content Director for the Vehicle Service & Repair Group. Erik is an ASE Master Automobile Technician with L1, and L4 credentials, who has been in the industry for over 25 years in various capacities. During that time, Screeden was a technician. He started out at a Ford dealership and continued to several independent repair facilities as well as spent time in the specialty aftermarket at a GM-specific performance shop. After his time as a technician came to an end, Screeden transitioned into a role providing scan diagnostic and J2534 tool support. He was then able to parlay his experience as a technician and a support specialist and use that in several technical sales roles.
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