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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.
R134
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.
First of all, you don't use R12. Rather, R134 which has the oil included.
It takes 2.2 lbs
Yes, it should have R134. Look on the A/C evaporator or on the compressor. it should be listed there.
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.
If the AC compressor is engaging it could be the heater control valve is stuck open. If the AC compressor is NOT engaging you probably have a problem with the controls, a sensor or the compressor.
Follow larger hose from air compressor usually by passenger side firewall near accumulator/drier
Jumped directly from the relay? Bad compressor clutch, bad relay, low or excess refrigerant.
The A/C compressor is driven by a belt attached to the engine which runs on gasoline. The A/C unit contains R134 refrigerant which is a gas.
Low refrigerant charge