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2012 Audi a6 Quattro. Serpentine belt broke two weeks ago. I…

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2012 Audi a6 Quattro. Serpentine...
2012 Audi a6 Quattro. Serpentine belt broke two weeks ago. I replaced both belts. Drove fine for a week. This Monday, serpentine belt broke again moments after putting car in Sport mode. Are my tensioners going out? It is my belief sports mode plays a part in this because of the mmi settings and options between comfort, dynamic etc.
Submitted: 8 months ago.Category: Audi
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11/23/2017
Audi Mechanic: eauto, The Car Guy replied 8 months ago
eauto
eauto, The Car Guy
Category: Audi
Satisfied Customers: 17,485
Experience: ase mechanic
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Hi . Thank you for asking your question on JustAnswer.

do all the pulleys spin free?

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Customer reply replied 8 months ago
They do. I notice there is linear movement on the crankshaft pulley. It slides front to back. I don't think that's normal.
Customer reply replied 8 months ago
Looks like there is two parts to the pulley. The inner and outer. Inner seems secure and has no play. Outter slides front to back and spins freely
Customer reply replied 8 months ago
Harmonic balancer needs replacement. Looks like rubber is gone.
Audi Mechanic: eauto, The Car Guy replied 8 months ago

that would be it...

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