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Hello~ The A/C & Air Circulation lights flash intermittently when the fan is turned on. When the fan is off, the Air Vent light flashes. It's still heating the car but the defrost isn't working that well. Could this be a fuse or something much bigger, like a serpentine belt? Help!

Answers from the Automotive Experts

Jessica Howe, Automotive Expert & Coach at


Thank you for writing in. It sounds like there may be an issue with the electrical system. You can start by testing the system's relay, which is like a fuse and a switch combined. It will be located with the other fuses and relays either under the hood or inside the cabin fuse box. If that relay is okay, you will want to look for a loose or dirty connection somewhere in the system. If you cannot find an obvious electrical issue and the relay is fine, you will want to have the system inspected by a trained technician. Good luck!

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