Brian,
You can trace most of it except the expansion valve and evaporator core. The expansion valve is under the dash above the gas peddle and is hooked to the evaporator core inside the air distribution box. The thing in the low pressure hose (large one) under the hood that has fuel lines hooked to it is a fuel cooler. For the freon, it is just a straight tube. So we have from the compressor (small hose) to the condenser, from the condenser to the dryer, from dryer to the expansion valve (blue hose on most cars) to the expansion valve under the dash, then to the evaporator, out of the evaporator back to the expansion valve and then back to the compressor. Again, what is your problem? I have been working on cars all my life, the last 27 years in my own shop. I have seen most problems many times. I'm sorry I don't have a diagram of the freon flow on these cars but it is very much like many other cars. The fuel cooler is the only thing unique to the MBs and a very few other cars.
Paul

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84 500 SEL (307,xxx miles)