And when you open it up, clean it up inside thoroughly while you're in there if you see any signs of dust bunnies in the making. If it is an older unit there might be considerable dust and such inside, which can undermine the fan's cooling ability significantly. That'll affect operations too sometimes.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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