PeachParts Mercedes-Benz Forum - View Single Post - Compressor Seized, go to R134a or keep R12?

dpetryk · #3 06-11-2007, 04:38 PM

Have the system completely flushed out. Use PAG 46 oil and refill with R12. Some people may say not to use PAG oils but experience shows that using the low viscosity PAG oils reduces failures significantly. The system has to have all the original mineral based oils removed as you never want to mix PAG and mineral oils together. A good solvent flush is required to be sure that all the mineral oil has been removed.

The combination of PAG 46 and R12 will give you the best performance and life possible.

You will need a good flush anyway since your compressor no doubt has shed all sorts of debris through out the system. If you don't flush out the system before replacing the compressor and drier the new compressor won't last long.