Alternator belt broken

SOURCE: fan belt replacement

Hey there tsukaska,

No problem.

• Get a 14mm or 9/16" socket and a long handled ratchet or breaker bar.
• Get the belt around all the pulleys except the A/C compressor or Alternator.
• The tensioner pulley is near the Alternator toward the center of the engine. It's on a spring loaded arm. Get your socket on the center nut of this pulley.
• Slowly pull the ratchet toward the center of the engine. The pulley will pivot on the arm allowing you to get the belt on the final pulley.
  
• Slowly release the tension.
  
• You're done

SOURCE: How to fit fan belt on my 1995 Mazda 626

there should be a tensioner, put a wrench on it or ratchet(can even buy the tool at local parts store) spring loaded so u have to give it some muscle

SOURCE: broken fan belt needs replacing

go to mercedes benz website and download your owners manual it's in there - or look at the one you have
mbwebsite - owner support - download manuals

SOURCE: broken fan belt

if you dont have the diagram on the car then you will need the manual from a local auto parts place.

SOURCE: how to fit a new alternator belt

If it's just a single belt and you know where the belt tightener is you can do it yourself. Just loosen the tightener up, put the belt on and tighten belt so there is about 1/2" deflection when you push on the belt in the center of the pulleys, then tighten the bolts.