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2008-2015 Mercedes Benz ML350 Serpentine Belt Replacement

If your 2008-2015 Mercedes Benz ML350 has...

iFixit Library 2008-2015 Mercedes Benz ML350 Moderate 15 - 30 minutes Guide 148660

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Guide overview

Before you begin

If your 2008-2015 Mercedes Benz ML350 has started making screeching noises when you accelerate, decelerate or when making a turn, use this guide to replace the serpentine belt. The serpentine belt is a continuous belt responsible for driving the alternator, power steering pump, water pump, AC compressor, etc. A worn-out or damaged serpentine belt will cause these components to malfunction and potentially damage the engine. Before beginning, it is important to ensure your engine is cold by leaving it off overnight; keep the engine off while following the guide.

Step 1

Repair step

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Release the hood latch.
Open and prop the hood.
Remove the plastic shield by pulling it up and toward you.

Step 2

Repair step

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Place a socket wrench with a 17 mm socket on the belt tensioner nut.

Step 3

Repair step

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Press down on the socket wrench counterclockwise to release the belt tension.
Remove the serpentine belt from the belt tensioner.

Step 4

Repair step

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Check each pulley surface to ensure cleanliness; clean the pulleys with a cloth if necessary.

Step 5

Repair step

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Route the new serpentine belt according to the owner’s manual.

Step 6

Repair step

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Place the 17 mm socket wrench on the belt tensioner and release the tension again, then quickly slide the new serpentine belt onto the belt tensioner.

Step 7

Repair step

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Check each pulley to ensure the serpentine belt is seated properly.

Step 8

Repair step

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Replace the plastic shield and close the hood.