Defrost from the window to vents or floor does not switch

Tiny
JOHN BINDER
  • MEMBER
  • 2013 HYUNDAI ELANTRA
  • 89,326 MILES
My heater in my car the temperature dial works from hot to cold and the blower fan works on all settings. The air conditioner knob also when you push it would light up blue but none of the setting light the way they should and won’t switch location. Any help would be great!
Sunday, April 12th, 2020 AT 10:46 AM

9 Replies

Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello, I'm Danny.

It sounds like you might be having a problem with the mode door actuator. It's a small electric motor that switches doors open and closed to direct air through certain ducts.I'm attaching picture steps below to help you diagnose the issue. Also, Here is a tutorial showing how to replace an actuator:

https://www.2carpros.com/articles/replace-blend-door-motor

The steps below are for your Hyundai Elantra. Notice step #4 showing how to test actuator to see if it switches to vent mode. Hope this hopes and thanks for using 2CarPros.
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Sunday, April 12th, 2020 AT 6:50 PM
Tiny
JOHN BINDER
  • MEMBER
  • 4 POSTS
This blue light use to light up each option, but now it’s dead no power to any of the buttons.
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Monday, April 13th, 2020 AT 11:32 AM
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello again.

First thing to check is the fuse for the A/C control switch. It's a 7.5 amp fuse. I've attached a picture of its location and circled in blue.Here is a tutorial on how to check/replace fuses:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Hope this helps and thanks again for using 2CarPros.

Danny-
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Tuesday, April 14th, 2020 AT 11:13 PM
Tiny
JOHN BINDER
  • MEMBER
  • 4 POSTS
The fuse is good and I checked all fuses and relays for power and all are good. Could it be a broken wire? I’m wondering if it’s easier to run a jumper wire to test the unit? Uh oh when I pulled the dash apart this is what I found:
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Wednesday, April 15th, 2020 AT 12:47 PM
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello again.

Uh oh ! Was there a rodent infestation? Maybe a wire was chewed. When I get home tonight I will attach an A/C - heater wiring diagram.

Danny-
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Wednesday, April 15th, 2020 AT 3:41 PM
Tiny
JOHN BINDER
  • MEMBER
  • 4 POSTS
Yes, definitely a rodent infestation! Car sat for a year while recovering from a stroke.
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Friday, April 17th, 2020 AT 5:46 AM
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello again.

Sorry to hear about you health issue and hope you are doing better. I've attached 2 pictures below of the heater and A/C system wiring diagrams for your Hyundai. I've cut the pictures in half so you can view them as larger.Here is a wiring check tutorial for you to view as well:

https://www.2carpros.com/articles/how-to-check-wiring

Hope this helps and let me know if you have any other questions about this issue.Thanks again for using 2CarPros.

Danny-
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Friday, April 17th, 2020 AT 10:25 AM
Tiny
JVFJOUN
  • MEMBER
  • 1 POST
That diagram is not for the mode door actuator. Mode actuator is on the drivers side. Heat actuator is left of glove box.
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Monday, January 29th, 2024 AT 6:09 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,321 POSTS
Sorry, for the confusion, here is the correct location for the mode actuator and how to change it out. Check out the images (below). Let us know if you need anything else.
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Tuesday, January 30th, 2024 AT 10:15 AM

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