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Q: The air pump/cooling fan relay is whining on 1997 Volvo 960

Following recent repair mechanic placed air pump/cooling fan relay on top of the battery--where it now sits??? I find this odd.
The relay is now making a high-pitched whining sound nearly all the time.
Does this mean I need to replace it? Where should it go?
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Well, he said he had moved it form an even worse place where the last mechanic had stuffed it.
Any ideas on the whining noise?
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