When vents are set to floor A/C blows hot air on drivers side cold air on one side

Tiny
KSA2367
  • MEMBER
  • 2004 CHEVROLET SUBURBAN
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 212,000 MILES
When A/C is on and the mode select is in the dash mode (upper level) A/C works in all vents. However, when I place the mode selector switch to floor (under dash) the drivers side vents goes hot. FYI I have the auto controls not manual controls and previously replaced blend door actuator under dash on passenger side.

Which blend door actuator is bad, the one above the gas pedal or in the middle of the dash board? Please tell me the the one above the gas pedal.

Thank you for any assistance you can give me.

Phil
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Tuesday, April 14th, 2020 AT 1:41 PM

9 Replies

Tiny
ASEMASTER6371
  • MECHANIC
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Good afternoon,

I attached the procedure for the left actuator. I also attached a picture for you.

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

Is this the one you replaced?

Roy

Temperature Valve Actuator Replacement - Left Side

Removal Procedure Notice:In order to avoid actuator damage, DO NOT apply power to the actuator when it is not installed in the HVAC module.

1. Remove the center console, if equipped. See: Console > Removal and Replacement
2. Remove the instrument panel (I/P) insulator panel. See: Dashboard / Instrument Panel > Removal and Replacement

imageOpen In New TabZoom/Print

3. Disconnect the electrical connector (1) from the left air temperature actuator (2).
4. Remove the screws from the left air temperature actuator (2).
5. Remove the left air temperature actuator (2) from the HVAC module assembly (3).
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Tuesday, April 14th, 2020 AT 1:57 PM
Tiny
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No, I have replaced this actuator. I need the instructions on the drivers side above the gas pedal. If you have those that would be extremely helpful. Thank you. Phil
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Tuesday, April 14th, 2020 AT 2:46 PM
Tiny
ASEMASTER6371
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Okay, the one under the drivers dash is a mode door actuator which has nothing to do with your issue.

I attached pictures of the location for you.

Roy
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Tuesday, April 14th, 2020 AT 2:55 PM
Tiny
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Okay, got it. Thank you very much. So the middle of the dash where the blend door actuator is can be accessed through the removal of the center console, radio etc?
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Tuesday, April 14th, 2020 AT 4:52 PM
Tiny
ASEMASTER6371
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Correct.

Roy
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Tuesday, April 14th, 2020 AT 5:03 PM
Tiny
KEN L
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Yes, you will need to remove all obstructions to get to the actuator. I would try the instrument cluster and possible the passenger side airbag will need to be removed as well. Here is what the book says in the diagrams below:

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 (With 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 (Without 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.

Check out the diagrams (below). Please let us know what happens.
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Tuesday, April 14th, 2020 AT 5:09 PM
Tiny
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Yes, thank you.

Phil
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Wednesday, April 15th, 2020 AT 7:08 AM
Tiny
CADE
  • MEMBER
  • 1 POST
  • 2004 CHEVROLET SUBURBAN
  • V8
  • 2WD
  • AUTOMATIC
  • 69,000 MILES
After replacing the battery, the dual zone a/c blows cold on driver side, hot on passenger side vents. I didn't turn the ac off before replacing battery, the rear air works fine. Is there a link between battery replacement and a/c malfunction? What is the problem? How can it be repaired?
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Tuesday, April 21st, 2020 AT 10:06 AM (Merged)
Tiny
2CARPRO JACK
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With ignition off remove the HVAC/ECAS fuse for a minimum of 10 seconds. Reinstall fuse and start truck, wait at least 40 seconds for the HVAC module to self calibrate
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Tuesday, April 21st, 2020 AT 10:06 AM (Merged)

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