Where did the Interdynamics Retrofit method come from?
The Interdynamics retrofit method is described by the US Environmental Protection Agency (EPA) in a July 1996 document titled: “KEEPING YOUR CUSTOMER’S CAR COOL: SOME GUIDANCE IN RETROFITTING A/C SYSTEMS TO R-134A”. The EPA refers to a “Least-Cost Aftermarket Retrofit” in which the system is not opened and there are no major component changes.