What is NOT recommended when converting an R-12 system to R-134a?

When converting an R-12 system to R-134a, not permanently installing conversion fittings using new hose clamps around the fittings is advisable because secure connections are crucial for maintaining system integrity and preventing leaks. When switching refrigerants, it is essential to ensure that all components are compatible and that the fittings are secured properly without creating permanent changes that may hinder future maintenance or repairs.

The conversion process typically involves using Fittings that allow easy return to the R-12 system if necessary, rather than permanently altering the system setup. This approach maintains flexibility, ensures compliance with regulations, and allows for troubleshooting without extensive modifications to the system.