so I have a macbook pro “15 “ 2017 with a one fan noise , and he said that the problem with one fan but you need to replace the two of them cause if we replace just one it would be faster than the old fan which will cause a problem , is that correct ?
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There is no issues replacing one fan at all, I often do just that.
The fans don’t run at the same RPM’s each is managed independently so it’s not unlikely one fan wears out before the other.
Depending on what you do the CPU fan is often the one that goes first.
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Here’s what he is saying. if you replace one now. then one will follow shortly after as they have both been in the machine for the same amount of time. One for GPU aka the graphics, One for CPU aka brain . the fans speed are controlled by temps. One will always be a bit hotter than the other. so naturally they wont go out at the same time. they are trying to save you some trouble since you already need 1 and fans are fairly cheap. It’s the same in a car. if the driver window motor goes out, then you can expect the passenger window to go in 2-4 months.
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