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Mode actuator? My vents will not change from floor, vent or defrost?

Tiny
JDBENNETT20
  • MEMBER
  • 2015 CHEVROLET SILVERADO
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 50,000 MILES
My A/C only blows on vent and so I changed the mode door actuator and it’s still not working, how can I fix it?
Tuesday, September 1st, 2020 AT 9:46 PM

32 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Here is a guide to help you fix it with a video that shows the blend door to give you an idea with the location of the mode door actuator in the images below which is next to the gas pedal as well with instructions in the diagrams below.

https://youtu.be/tY6M92fA2ug

I am attaching the wiring diagram and the instructions on how to replace the mode actuator. We just need to make sure you replaced the correct one because they are commonly mistaken.

If this is the actuator that you replaced then we need to check the voltage coming from the control module because I suspect you have a control module issue.

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

Please run through this and let us know what you find. Thanks
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Tuesday, February 2nd, 2021 AT 1:46 AM
Tiny
PROSPORT83
  • MEMBER
  • 1 POST
  • 2009 CHEVROLET SILVERADO
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 77,000 MILES
I have dual climate control and the heat and defrost do not work. I felt the hoses and they get hot so there should be nothing wrong with the heater itself. It seemed to happen after an electrical issue with my truck. My truck was stuck on the heat all last winter. I was luckily able to get it to switch over to AC for the summer. Now it will not switch back to the heat or defrost. When you click defrost, it just blows out harder in the front vents.
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Friday, April 30th, 2021 AT 11:04 AM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,490 POSTS
Hello,

This sounds like the mode actuator is not working. Here is a guide to help you find the location of the actuator and how to replace it:

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

Check the diagrams below.

1 - Air Temperature Actuator - Right
2 - Re-circulation Actuator
3 - Junction Block - Right I/P X4
4 - G200
5 - Blower Motor
6 - Air Temperature Sensor - Lower Right
7 - Air Temperature Actuator - Left
8 - Blower Motor Control Module
9 - Air Temperature Sensor - Lower Left
10 - Mode Actuator

Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.

Cheers, Ken
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Friday, April 30th, 2021 AT 11:04 AM (Merged)
Tiny
DOUGD14147
  • MEMBER
  • 1 POST
  • 2003 CHEVROLET SILVERADO
  • 5.3L
  • V8
  • 2WD
  • AUTOMATIC
  • 160,000 MILES
I need correct name and or part number for the actuator that moves the air flow from the defrost, to the vents and to the floor. Extend cab truck.
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Friday, April 30th, 2021 AT 11:04 AM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning.

It is called the mode door actuator. It controls air flow out the vents.

Roy

1. Remove the floor air outlet duct extension (1) from the floor duct (2).
2. Remove the center console.
3. Remove the screws from the center console duct.
4. Remove the center console duct.

5. Disconnect the electrical connection from the mode actuator (10).

6. Remove the mode actuator mounting screws from the HVAC module.
7. Remove the mode actuator as an assembly with the actuator cam.
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Friday, April 30th, 2021 AT 11:04 AM (Merged)
Tiny
JEFF LYDER
  • MEMBER
  • 3 POSTS
  • 2003 CHEVROLET SILVERADO
  • 6.0L
  • V8
  • 4WD
  • AUTOMATIC
  • 117,000 MILES
A/C only blows hot air, fan speed dial works fine as does dial to select face vent, foot, defrost etc. Compressor is cycling on and off. A/C lines at fire wall engine bay one is hot one is cold. Tested fuses all ok, disconnected battery to try reset. No change. Please advise. Thank you
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Friday, April 30th, 2021 AT 11:04 AM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check to see if the actuator is working meaning blocking the cool are from coming in as it controls temperature.
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Friday, April 30th, 2021 AT 11:04 AM (Merged)
Tiny
JEFF LYDER
  • MEMBER
  • 3 POSTS
You are talking about the actuator on passenger side correct?
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Friday, April 30th, 2021 AT 11:04 AM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
The picture shows drivers side but you may have on there as well. I am assuming this is manual control like you do not set the temperature. If it is auto then it is another problem and youwill need to get it scanned.
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Friday, April 30th, 2021 AT 11:04 AM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
It may be on the bottom that is for temperature. It may be low on charge as well but this is pretty common. You might try pulling the HVAC fuse as it sometimes will reset these. Pull fuse with key on sixty seconds then reinstall and wait a minute.
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Friday, April 30th, 2021 AT 11:04 AM (Merged)
Tiny
JEFF LYDER
  • MEMBER
  • 3 POSTS
Yes it is manual control, thank you for quick response.
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Friday, April 30th, 2021 AT 11:04 AM (Merged)
Tiny
TOJIN
  • MEMBER
  • 2 POSTS
  • 2002 CHEVROLET SILVERADO
  • 4.3L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 240,000 MILES
I have air blowing they the top n bottom but midlevel n and no cool air blowing as well but AC ia full so how do I know which blend actuator to replace?
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Friday, April 30th, 2021 AT 11:04 AM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good evening.

Attached is a diagram and procedures for the blend door actuator.

Did you verify the pressures were correct in the AC system?

Roy

https://www.2carpros.com/articles/car-air-conditioner-not-working-or-is-weak

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

REMOVAL PROCEDURE

imageZoom/Print

1. Remove the instrument panel hush panel.
2. Disconnect the electrical connector (8) from the air temperature actuator (9).

imageZoom/Print

3. Remove the air temperature actuator retaining screws.

imageZoom/Print

4. Remove the air temperature actuator.
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Friday, April 30th, 2021 AT 11:04 AM (Merged)
Tiny
JOVANI281FRANK508BAYTOWNTX
  • MEMBER
  • 1 POST
  • 2002 CHEVROLET SILVERADO
  • V8
  • 2WD
  • AUTOMATIC
  • 250,000 MILES
My front A/C vents won't blow my defrost vents work and so do the vents for my back seats I can't tell that it's reading it when I switch from defrost to front vents but nothing comes out.
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Friday, April 30th, 2021 AT 11:04 AM (Merged)
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
This is because you need to replace the mode actuator. Here is a guide that will help you see which one to replace and where it is.

Here is a guide that will help with this.

https://www.2carpros.com/articles/air-vents-stay-in-the-defrost-position

Here is a guide that will help with replacing a blend door actuator. Clearly this is different then a mode door but it will help with general info.

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

Please let us know if you need anything else to get the problem fixed.

Cheers
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Friday, April 30th, 2021 AT 11:04 AM (Merged)
Tiny
GARY MENDRALA
  • MEMBER
  • 1 POST
  • 2001 CHEVROLET SILVERADO
The heater control will not actuate to flow to the floor. The fan control works, the thermostat works, the direction control will direct to the windshield, upper vent but will not go to the lower heat duct. Is the control vacuum or electrically actuated and where are the baffle and direction controls located?
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Friday, April 30th, 2021 AT 11:04 AM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
This one uses an electric actuator and one motor controls all the modes switches. If you observe it while switching you may see something getting jammed or broken. Look up from the driver's side.


https://www.2carpros.com/forum/automotive_pictures/561653_Mode_actuator_01_1500_1.jpg

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Friday, April 30th, 2021 AT 11:04 AM (Merged)
Tiny
RROBINS
  • MEMBER
  • 1 POST
  • 2000 CHEVROLET SILVERADO
Is the Air inlet door actuator and panel mode door actuator the same?
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Friday, April 30th, 2021 AT 11:04 AM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
No there are a few depending on your system there is air inlet, mode and temp actuators pic shows mode actuator which is by gas pedal. Try pulling hvac fuse inside truck for 60 seconds with key on then reinstalling it may reset it.
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Friday, April 30th, 2021 AT 11:05 AM (Merged)
Tiny
HROD68*
  • MEMBER
  • 1 POST
  • 1999 CHEVROLET SILVERADO
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 200,000 MILES
It only blows out out the vents on top of my dashboard. Help please !
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Friday, April 30th, 2021 AT 11:05 AM (Merged)

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