Check from underneath the car.

It's been a while, but I recall there are four horizontal bolts holding the compressor.
Might have to move the PS out of the way, but this should be clear upon inspection.

You've got to get the front up inthe air, and go in from underneath.

Jim

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14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles