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2014 Kia Rio EX
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I have a 2014 Kia Rio EX. The AC system works sometimes. When it works its not at full power but the air is cool. When it stops working nothing blows through the vent but if I turn the knob on I can here the change in the car like its trying to work. Anyone know what this could be?
 

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2014 Kia Rio
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I would be looking at the blower motor, blower resistor, blower switch, and the ground. The change you hear is probably the AC compressor coming on but if the blower isn't working than of course there is no air.

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How to test the blower resistor...

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