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AC blows air intermittently

Tiny
EQUINOS
  • MEMBER
  • 2007 HYUNDAI SONATA
  • 3.3L
  • V6
  • 2WD
  • AUTOMATIC
  • 101,000 MILES
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.
Tuesday, January 15th, 2019 AT 11:25 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,690 POSTS
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.
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Wednesday, January 16th, 2019 AT 4:08 PM

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