Q: all belts broke when leaving repair shop from diagnosis of lous engine squeel

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the car just started making a really loud squeeling sound after it warmed up on acceleration. took to repair shop replaced some belts, upon leaving the shop every belt broke. mechanic said he had never herd of that happening and was upset after working and investigating the original noise all day. possible cause

My car has 150000 miles.
My car has an automatic transmission.

Hi there. There are typically three reasons why brand new belts will squeal loud then brake quickly. First, if the pulley’s are damaged (which typically happens the same time as belts are damaged) but they are not replaced, they can cause the belts to break due to excessive heat (or friction). Second, if the pulley’s are not properly aligned when the belts were installed, it can also create excessive heat on the belt and cause the to break quickly. Third, the belts may not have been the right size for your vehicle. The third problem happens more frequently than you’d think; especially when a mechanic is rushed in a shop to complete multiple jobs during a day.

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