R12 instead R134a

[fETAH]

If in one fridge or freez which have colding sistem and compressor calculated to work with refrigerant R134a, is it possible instead R134a to use refrigrant R12 .If not why.I need somebody to help me.

[nike123]

It is not possible without adjustment of capillary tube length.
Also, it is forbidden by law in most countries and harm Earth ozone layer.
What will you leave to your kids?