To work properly, the drive belt must be under proper tension.
One common symptom of a loose drive belt is a loud screeching noise that lasts for a few seconds when the engine is started.
If the automatic spring-loaded belt tensioner is sticking or shows signs of excessive wear, it makes sense to replace it together with the drive belt. A hydraulic belt tensioner might need to be replaced if it’s leaking oil.
Does the drive belt have to be replaced when an A/C compressor or alternator is replaced? No, it’s not necessary. However, if it doesn’t take extra labor and the old belt shows some wear, it is not a bad idea to replace it too.
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