I have a 97 E320 that has had persistent problems with cooling the cabin in hot weather (especially sunny days).
After 4 abortive attempts, my dealer replaced the evaporator and expansion valve and for two weeks I was cool!
However, yesterday it reverted back to its old ways.
When the cabin is hot, the fan blows max for only a minute or so, then falls back to level 3 - which is not enough to cool down. Even setting the temp control to 60 deg has little effect.
Can anyone help me point my dealer in the right direction?