Can you use a r 134a compressor as a replacement for a r 22 system?

You cannot directly use an R-134a compressor as a replacement for an R-22 system. The two refrigerants operate at different pressures, and R-134a compressors are designed for the properties of R-134a, which could lead to inefficiency or damage if used with R-22. If you need to switch refrigerants, it's advisable to replace the entire system or ensure that all components are compatible with the new refrigerant.