Hi,
That is an idler pulley. Basically, it does nothing more than direct the belt in a needed direction. In this case, the positioning causes an increase in the belt to pulley surface area for the compressor. I attached a pic below and highlighted the pulley I believe you are referring to. If that is incorrect, let me know.
Let me know if that helps or if you have other questions.
Take care,
joe
See pic below.
Image (Click to make bigger)
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Saturday, September 30th, 2023 AT 10:06 PM