Dash fan

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Mazda 5
I just noticed that my dash fan (cabin A/C heat) speeds up and slows down seemingly indiscriminately. It's kind of annoying. Any solutions?
 
Is it on auto mode? Try setting the speed to low in manual. See if that makes the speed changes. You probably have the internal temperature sensor not reading properly.
 
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I'll have to double check that. I don't use the auto feature as a rule, but it could have been switched on unknowingly.
 
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