You will only see the top of it, behind the headlight. The rest of the "can" part hangs below sheet metal IIRC. So it won't necessarily look the same as it does in diagrams. It should have a pigtail for the pressure switch going to it. I just changed one out last October so I know it's there...

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280