It's under the passenger side under dash paneling. Their should be two or three screws you need to remove to get the panel down. You'll see the electrical plug going to blower motor. Remove the blower motor cover and you'll have access to blower and regulator.
Take it into the shop. It's a whole lot easier.
For my 1996 E320 I purchased a set of removal tools(2) that do removal of both radio and climate control
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you access the fan blower by removing the windshield wiper motor from the outside of the car.
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how to replace cabin air filter in 1999 Mercedes e320? how to replace cabin air filter in Mercedes e320?
From what I know the blower brushes are worn down. Easy fix just do a search for "replacing blower brushes on 85 Mercedes 300D ZaneRen
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The fuel capacity of 1996 Mercedes e320 is 80 litres.