My ac is not working, I want yo put some dye in it. R12 is not so easy to come by, can I put some of that freeze12/dye or something cheaper and easier to come by to help find the leak?????

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1981 300TD
2005 C55
2004 E500
1999 ML430
1992 400E
1998 C43
2001 SL500
1988 300SEL
1986 190E 16V
1991 190E 2.6

No.

Freeze 12, cleverly named to confuse you, is about 75% r134 & 25% something-pane (propane? butane? something). r134 is not compatible with the mineral oil now in your system. Add Freeze12 and your compressor will die in the future.

Either top up r12, or have shop capture the r12 & flush the system & add only Freeze12 plus PAG oil, or capture r12, flush & convert to r134 plus PAG oil.