Why would you want to even consider doing this? R12 is no longer in production and as such it cost almost 4 times as much as R134. But to answer your question, use R12 in a R134 system and you will destroy the compressor as the oil is not compatible with R134 oil.
If you mix r12 with r134 air conditioning system, it will cause a high pressure in your airconditioning system and eventually damage the compressor and the evaporator. R12 is only for r12 aircon and something with r134, it can't be mix.
how much r134 does a ford 500 take
The 1992 GMC Suburban came from the factory with R12 not R134. Unless it is has been converted to use R134 you cannot simply add R134. If it has been converted you need to have the leak fixed before adding anything. It is illegal to add refrigerant to any system without first repairing the leak. How much it will hold depends on how much leaked out.
First of all, you don't use R12. Rather, R134 which has the oil included.
1.53 lbs of R134
read sticker on A/c unit should be there Rick ASE L-1 MAster TransMichigan.com
Yes, it should have R134. Look on the A/C evaporator or on the compressor. it should be listed there.
It is probably low on R134 refrigerant, compressor clutch may be going out also but it is most likely in need of a recharge.
If the pressures are always equal running, the compressor is bad and would need replaced
If your vehicle is a 1994 or older is contains R12. 1995-96 It man contain R12 or R134. After 1996 it will contain R134. It is listed on a label near the compressor dryer. Engine size means nothing.
100.50