Blend doors calibration instructions please?

Tiny
E91749
  • MEMBER
  • 2014 CHEVROLET SILVERADO
  • 4.3L
  • V6
  • RWD
  • AUTOMATIC
  • 115,000 MILES
Defrost door are out of calibration. No scan tech2. How to reset and calibrate have system with no scanner? Thanks

Do you
have the same problem?
Yes
No
Friday, October 6th, 2017 AT 11:34 AM

24 Replies

Tiny
STEVE W.
  • EXPERT
From the book -
Do not adjust any controls on the HVAC control module while the HVAC control module is self-calibrating. If interrupted, improper HVAC performance will result.

Clear all DTCs.
Place the ignition switch to the OFF position.
Install the HVAC actuator.
Connect all previously disconnected components.
Remove the HVAC control module fuse for a minimum of 10 s.
Install the HVAC control module fuse.
Start the vehicle.
Wait 40 s for the HVAC control module to self-calibrate.
Operate system and verify that no DTCs have set as current DTCs.
Was this
answer
helpful?
Yes
No
+1
Tuesday, December 1st, 2020 AT 8:24 AM
Tiny
FRANKALONG
  • MEMBER
  • 2004 CHEVROLET SILVERADO
  • 120,000 MILES
What is the procedure for calibrating the actuators after they have been replaced? I have automatic dual climate control. I am assuming that the actuator notch has to be in the center position. And that any codes should be erased. Is it best to disconnect the battery or can the HVAC fuse be removed then reinstalled? There is some confusion as to the correct method.
Thanks
Was this
answer
helpful?
Yes
No
Friday, April 30th, 2021 AT 1:03 PM (Merged)
Tiny
ASEMASTER6371
  • EXPERT
Good evening.

Here is how you can recalibrate the blend door actuators

RE-CALIBRATING ACTUATORS

When replacing the HVAC control module it will be necessary to allow the HVAC control module to perform a calibration process. When installing the HVAC control module be sure to perform the following:

IMPORTANT: Do not adjust any controls on the HVAC control module while the HVAC control module is self-calibrating. If interrupted, improper HVAC performance will result.

1. Place the ignition switch to the OFF position.
2. Disconnect the scan tool.
3. Install the HVAC control module.
4. Connect all previously disconnected components.
5. Start the vehicle.
6. Wait 40 seconds for the HVAC control module to self-calibrate.
7. Verify that no DTCs have set as current DTCs.

When replacing the HVAC actuator it will be necessary to allow the HVAC control module to perform a calibration process. When installing the HVAC
actuator be sure to perform one of the following:

IMPORTANT: Do not adjust any controls on the HVAC control module while the HVAC control module is self-calibrating. If interrupted, improper HVAC performance will result.

Preferred Method (w/ Scan Tool)
1. Clear all DTCs.
2. Place the ignition switch in the OFF position.
3. Install the HVAC actuator.
4. Connect all previously disconnected components.
5. Start the vehicle.
6. With the scan tool, initiate the Motor Re-calibration feature of the Heating and Air Conditioning Special Functions menu.
7. Verify that no DTCs have set as current DTCs.

IMPORTANT: Do not adjust any controls on the HVAC control module while the HVAC control module is self-calibrating. If interrupted, improper HVAC performance will result.

Alternate Method (w/o Scan Tool)
1. Clear all DTCs.
2. Place the ignition switch to the OFF position.
3. Install the HVAC actuator.
4. Connect all previously disconnected components.
5. Remove the HVAC/ECAS fuse for a minimum of 10 seconds.
6. Install the HVAC/ECAS fuse.
7. Start the vehicle.
8. Wait 40 seconds for the HVAC control module to self-calibrate.
9. Verify that no DTCs have set as current DTCs.

This guide can help as well

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

Roy
Was this
answer
helpful?
Yes
No
Friday, April 30th, 2021 AT 1:03 PM (Merged)
Tiny
CKUENY
  • MEMBER
  • 2004 CHEVROLET SILVERADO
  • 200,000 MILES
The have system in the truck blows fine and at the appropriate levels. The problem I have is when I start the vehicle to warm it up, it will not blow hot air until the vehicle is put in gear and driving down the road. Any suggestions as to what is causing this?
Was this
answer
helpful?
Yes
No
+1
Friday, April 30th, 2021 AT 1:03 PM (Merged)
Tiny
HMAC300
  • EXPERT
Might be air in system check for full coolant level. It may also be a an actuator not fully open. Try pulling hvac fuse for 60 seconds then reinstalling that resets actuators but you wouldn't know until next time you fired truck up
Was this
answer
helpful?
Yes
No
+1
Friday, April 30th, 2021 AT 1:03 PM (Merged)
Tiny
TONYH3
  • MEMBER
  • 1999 CHEVROLET SILVERADO
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 200,000 MILES
I installed a new blend door actuator. I have tried at least 7 different ways to reset the actuator but all have failed. The problem is cold setting produces heat. Hot setting produces cold.
Was this
answer
helpful?
Yes
No
+1
Friday, April 30th, 2021 AT 1:03 PM (Merged)
Tiny
ASEMASTER6371
  • EXPERT
Good afternoon,

After replacing with a new actuator, you remove the HVAC1 fuse for 2 minutes. Then turn on the key and install the fuse. Leave it for 3 minutes. That is the procedure for calibration.

Did you replace the actuator? This guide can help

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

Check out the diagrams (Below). Please let us know what happens.
Was this
answer
helpful?
Yes
No
+2
Friday, April 30th, 2021 AT 1:03 PM (Merged)
Tiny
TONYH3
  • MEMBER
Hello,

I replaced the actuator. Then went through the procedure of pulling the fuse for 2 minutes and turning on the key(not starting) and then installing the fuse and waiting for 3 minutes. Same result twice. I tried once turning key off after calibration, then starting engine to test controls. The second time I just started engine and tested the controls after calibration. The actuator did the same thing: cold setting was hot and hot setting was cold.
Was this
answer
helpful?
Yes
No
+1
Friday, April 30th, 2021 AT 1:03 PM (Merged)
Tiny
ASEMASTER6371
  • EXPERT
Okay, it is not the actuator. You will need to test for power to the actuator to be sure it is getting a signal from the control head.

With the key on, you need to test for 12 volts at the actuator motor. The color is on the diagram I attached.

Start there.

Roy
Was this
answer
helpful?
Yes
No
+2
Friday, April 30th, 2021 AT 1:03 PM (Merged)
Tiny
TONYH3
  • MEMBER
I checked pins 5 and 6 on the connector and have 11.7V.
Was this
answer
helpful?
Yes
No
+1
Friday, April 30th, 2021 AT 1:03 PM (Merged)
Tiny
ASEMASTER6371
  • EXPERT
Okay, you have a low battery in the truck.

Is that with the actuator hooked up or disconnected?

Roy
Was this
answer
helpful?
Yes
No
+1
Friday, April 30th, 2021 AT 1:03 PM (Merged)
Tiny
TONYH3
  • MEMBER
Disconnected.
Was this
answer
helpful?
Yes
No
+1
Friday, April 30th, 2021 AT 1:03 PM (Merged)
Tiny
TONYH3
  • MEMBER
I also started engine and have 14.64V.
Was this
answer
helpful?
Yes
No
+1
Friday, April 30th, 2021 AT 1:03 PM (Merged)
Tiny
ASEMASTER6371
  • EXPERT
Only one of the wires should have power, not both.

I would suspect the control head is not working correctly or the wiring is shorted together between the actuator and the control head.

Roy
Was this
answer
helpful?
Yes
No
+1
Friday, April 30th, 2021 AT 1:03 PM (Merged)
Tiny
TONYH3
  • MEMBER
You are correct. Using a common ground, with key on, pin 5 has 12.4V, while pin 6 has a low or no mV value. So there is no shorting.
Was this
answer
helpful?
Yes
No
+1
Friday, April 30th, 2021 AT 1:03 PM (Merged)
Tiny
ASEMASTER6371
  • EXPERT
Then how did you come up with voltage on both pins?
Was this
answer
helpful?
Yes
No
+1
Friday, April 30th, 2021 AT 1:03 PM (Merged)
Tiny
TONYH3
  • MEMBER
I assumed the voltage across both pins was what you were looking for. Sorry.
Was this
answer
helpful?
Yes
No
+1
Friday, April 30th, 2021 AT 1:03 PM (Merged)
Tiny
ASEMASTER6371
  • EXPERT
No, that is good. The fact you have system voltage tells me there is no short.

It looks like the control head.

Roy
Was this
answer
helpful?
Yes
No
+1
Friday, April 30th, 2021 AT 1:03 PM (Merged)
Tiny
TONYH3
  • MEMBER
Thanks Roy. I will move on to that.
Was this
answer
helpful?
Yes
No
+1
Friday, April 30th, 2021 AT 1:03 PM (Merged)
Tiny
ASEMASTER6371
  • EXPERT
You are welcome.

Always glad to help.

Roy
Was this
answer
helpful?
Yes
No
+1
Friday, April 30th, 2021 AT 1:03 PM (Merged)

Please login or register to post a reply.

Sponsored links