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Do not attempt to inspect an accessory drive belt with vehicle running.
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When working near the radiator cooling fan, disconnect the fan motor lead. The fan is temperature controlled and can start at any time regardless of ignition mode. You could be injured by the moving fan blades.
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You can be badly injured working on or around a motor vehicle. Only do service work for which you have the knowledge and the proper equipment. If you have any doubt about your ability to perform a service job, take your vehicle to a competent mechanic.
When inspecting accessory drive belts, small cracks that run across ribbed surface of belt from rib to rib, are considered normal. These are not a reason to replace belt. However, cracks running along a rib (not across) are not normal. Any belt with cracks running along a rib must be replaced. Also have the belt replaced if it has excessive wear, frayed cords or severe glazing.
Accessory Belt (Serpentine Belt)
Rib chunking (one or more ribs has separated from belt body)
Rib or belt wear
Longitudinal belt cracking (cracks between two ribs)
Belt slips
Groove jumping (belt does not maintain correct position on pulley)
Belt broken (identify and correct problem before new belt is installed)
Noise (objectionable squeal, squeak, or rumble is heard or felt while drive belt is in operation)
Some conditions can be caused by a faulty component such as a belt pulley. Belt pulleys should be carefully inspected for damage and proper alignment.
Belt replacement on some models requires the use of special tools, we recommend having your vehicle serviced at an authorized dealer.