:devil:

My ac refrigerant R134a was empty
replaced it with 3 cans of refrigerant 11 oz each
ac does not blow as cold as it used to
should i add more
its a 1995 525i

Please Help

You didn't mention repairing the leak. If you're loosing refrigerant, you have a leak, and any new refrigerant you add is going bye-bye, too. While ytou've still got pressure in the system, use soap bubble solution on all of the connection points, bubbles form at the leak. Also have a good look at the condenser. If you see an accumulation of oil or oily dirt at one spo on the condenser, (usually at the u-tubes at the end of each row), that's the spot. I'd suggest taking it to an auto A/C mechanic. If the system was flat, you've also lost oil. If the leak is on the low pressure side of the system, you've sucked in air, which will impede performance (air doesn't condense, so the system can't cool the air in your car as well) and also cause the refrigerant oil to break down, bye-bye seals, bye-bye compressor. Spend a little money now, save a lot later.
Kent