Belt troubleshooting

Why do belts slip?

A car is equipped with an A/C compressor driven by a V-type belt. As the compressor cycles, the belt squeals briefly. A check with a belt tension gauge indicates the belt is correctly adjusted.

Belt slippage

A V belt that is not wide enough will run on the bottom of the pulley providing very little belt friction regardless of the correct tension. V belts get their friction by wedging themselves into the V groove.

What belt squeals when I start my car up?

An overcharged AC system condition can cause the high-side pressure to be so high as to resist the start-up of the compressor.

In the long run, the clutch or belt will usually fail.

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