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Hey y'all. I don't pretend to be a professional mechanic, but I have spent my time taking things apart and putting them back together. I'm having a blower problem in my 2015 Mazda 3 i SV and I don't know if it is a blower motor itself or the resistor. My blower started working intermittently. When it isn't working, it will randomly start when I hit a bump. I check the relay and that is fine. Both the blower and the resistor are buried. I'm not sure which to replace next. Any help is appreciated!

Mark
 

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First check to make sure there's power and ground at the relay, and then jump the blower at the relay when it's not working, to see if it will spin with direct power applied.
 
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