AC blows air intermittently

2007 HYUNDAI SONATA

101,000 MILES • 3.3L • V6 • 2WD • AUTOMATIC

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The AC blows air on and off. When it is blowing air it doesn’t stop blowing air until I turn of the AC and turn it on again or until I turn off the car and turn it on again. Sometimes the car will blow air when I start it and sometimes it won’t.

Jan 15, 2019 at 11:25 AM

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Hello,

This sounds like the relay or controller issue. Here are the blower motor and HVAC system wiring diagrams so you can see how the system works and the relay and controller location. I would try the relay first.

This guide will help you test it.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.

Images (Click to enlarge)

Jan 16, 2019 at 4:08 PM