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One is the A/C. The evaporator or compressor is located behind the dash, and if it goes out, which it will eventually, there's a lot of labor involved getting to it.
I dont see how the compressor could be behind the dash (other than the fact that it is in the engine bay), it must be mounted to the engine.
The evaporator in any car is behind te dash, and in any car is a royal pain to access, as some or all of the dash needs to be removed to get to it.
If its weak, is weak... this may be a virtue of the fact that some of these cars the 86-94ish MYs) came with R12 and likely got retrofitted to R134a, which runs at higher pressures, and cases havoc with most any AC system.
Even if not, an evaporator being a pain to access is nothing new, IMO.
As for MBs in general, ga$$ers are nice, but its the diesels that realy give good value and longevity. In a diesel, an owner wouldnt think twice about pulling the dash and replacing an evaporator, etc., if it is a nice rust free example, as the car will last a LONG time.
I dont think they sold diesel w124s over here, but if they did, this is what Id be looking for.
Even if not, and even if he needs a $2500 headgasket job, or a $2000 evaproator replacement, is he buying a w124 for a nice, well-engineered, long lasting car, or is he buying a mercedes for the chance to show off a three-pointed star at the least cost possible for a relatively modern lookng example? The difference in desire and sentiment will make the choice if the car is right or not.
Also, if there is a good independent MB shop around, it can help a LOT.
JMH