[Shotimes] A/C, R12 to R416, OK ?

[Sho List]

I work in a profession where I have some guys maintaining
some cooling equipment all day.  I told a co-worker of my
poor-working A/C.  I really think the manual blend door bypass
and a coolant recharge will work.  He said we have no R12
around, but we do have R416 which "has the some of the
components of R12" and I could re-charge on it.

Anyone know if this is true ?  Do I need to "release" all
of whatever is left of my old coolant before I try this ?

Thanks all,
Chad L
92 Red