Monovalve Location

Where the heck is the monovalve on a 560sl??

I had to replace the low side a/c pressure hose and expansion valve (it was clogged) now the dang thing blows heat all the time. It's like driving in hell.... (grin)

I haven't refreshed the R134 yet, still waiting on my new evaporator to arrive.

Does the a/c system have anything to do with the monovalve??

thanks!