Question about 2002 Chevrolet TrailBlazer

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NO HEAT ON FLOOR, I INSTALLED A NEW ACTUATOR BUT STILL NO AIR ON FLOOR SETTING , I HAVE THE SAME PROBLEM WITH MY 99 S-10. IS THERE A PROBLEM IN THE SWITCH WHICH CONTROLS THE DIFFERENT AREAS IN WHICH YOU WANT THE AIR TO COME OUT ? THIS IS ALL OPERATED BY VACUME

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  • Chevrolet Master
  • 6,826 Answers

The floor usally has a vaccum servo,so check it to see if the servo is moving.Pull the ac/heater control from dash,and remove the vaccum plug.Spray some silicone(silicone spray only)in the vaccum lines(plug)and the receptical for the plug.Do this while it is on,and engine running,this will unstick the vaccum switch if it is stuck.Also before starting this,check for vaccum at this vaccum switch.If there is no vaccum,go under hood and follow the vaccum comming out of firewall,and find a vaccum reservoir,or a vaccum check valve,and check them to see if they are damaged or not connected.I hope this helps,if you need more help let me know.

Posted on Oct 05, 2009

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My air condition and heat works on defrost only sometime comes out vents last seconds didn't matter were controller set


Not sure what year, make or model vehicle is in question, but the issue is due to an actuator that has gone bad. Sometimes referred to as a mode actuator or blend door actuator. This actuator controls where air/heat will blow from (defroster vent, forward vents, floor vents or combo, etc.). Good luck. Ron @ Speed-O-Repair.

Aug 24, 2014 | Cars & Trucks

1 Answer

Air blend door actuator


Possible bad blend door actuator .some gm cars can be relearned to the new climate control head

Jul 28, 2013 | 2001 Oldsmobile Aurora

1 Answer

My 2004 Avalanche ' heating system will not heat. No matter what the setting it either blows no air or cold air and it is 25 degrees outside so this is a problem. The engine is up to temp and I have tried...


The most likely cause is a failed blend door actuator; however I recommend a little troubleshooting. First, can you hear a clicking sound behind the dash when you turn the setting to hot? If yes, it is certainly the actuator stripping its gears. If not, check to make sure the heater hoses are both hot as they connect to the heater core at the firewall (in the engine compartment). If one or both of the hoses do not get hot, there is a blockage caused either by an air bubble or a stuck water control valve in the heater hose. If the hoses are both hot, the indication is again the blend door actuator.

Below are instructions for replacing the actuator. Look at the diagrams carefully--the big arrows point to the front of the truck and the actuator is on the side of the heater box above the outlet duct that runs to the driver's side of the floor. Also, the actuator is expensive, so I recommend you make sure it's bad and shop around a bit to get a good price. To check out the actuator, first see if you can turn the blend door by hand. If you can't turn it, maybe it's jammed. Also, reconnect the actuator after removing it and see what it does when you turn the heater to hot.

Removal & Installation
  1. Remove the floor air outlet duct extension (1) from the floor duct (2).

    jturcotte_393.gif

Fig. Remove the floor air outlet duct extension (1) from the floor duct (2)


Disconnect the electrical connection at the blend door actuator (#10 in pic below). jturcotte_394.gif

Fig. Blend door actuator and related components


Remove the blend door actuator mounting screws from the HVAC module.


Remove the blend door actuator as an assembly with the actuator cam.
jturcotte_396.gif

Fig. Remove the blend door actuator mounting screws from the HVAC module



To install:

  1. Install the blend door actuator as an assembly with the actuator cam.
    1. Line up the heater/defroster valve lever with the blend door actuator cam slot.
    2. Line up the A/C valve lever with the blend door actuator cam

  2. Install the blend door actuator mounting screw to the HVAC module.
    1. Tighten the blend door actuator mounting screw to 14 inch lbs. (1.6 Nm).

  3. Connect the electrical connection at the blend door actuator (10).
  4. Install the floor air outlet duct extension (1) to the floor air duct (2).


Picture of actuator:


jturcotte_57.jpg

Dec 07, 2010 | 2004 Chevrolet Avalanche

1 Answer

The heat in my 2006 grand prix will not get hot. We replaced the thermostat and got nothing. So I got the radiator flush and force filled again. Still nothing. Temp of the motor still gets to the middle,...


Are the 2 tubes that go to the heater core getting hot? If so, then the blend door is not opening to allow heat to get to the cabin.

Possible vacuum motor problem, either disconnected, or the controller for the blend door is broken is likely problem.

Troubleshooting by Symptom Poor Heater System Performance CAUTION
Check all fluid levels and adjust as needed, before operating vehicle for extended periods at idle.
  1. Start the engine.
  2. Idle the engine until the thermostat opens (upper radiator hose will be hot) Is the engine at normal operating temperature (approx. 200° F)? If yes, go to the next step. If no, go to step 16.
  3. Set the mode selector to FLOOR mode.
  4. Set the heater control selector to the warmest temperature setting.
  5. Set the blower speed the lowest setting.
  6. Carefully feel the inlet and outlet heater hoses at the heater core. Is the inlet heater hose significantly hotter than the outlet heater hose? If yes, go to step 14. If no, go to the next step.
  7. Set the mode selector to PANEL mode.
  8. Select the maximum blower speed.
  9. Select the warmest temperature setting.
  10. Place a thermometer into the center I/P PANEL air outlet and affix a second thermometer to the heater core outlet heater hose.
  11. Record the temperature at the center I/P PANEL air outlet and at the heater core outlet heater hose. Are the two temperature readings about equal? If yes, go to the next step. If no, go to step 13.
  12. Inspect and repair the cowl, cowl area, recirculation door, and the HVAC evaporator/heater core case for cold air leaks. Repair any problems found, go to step 17.
  13. Inspect the temperature door operation. Repair any problems found, go to step 17.
  14. Turn OFF the engine. Back-flush the heater core. Start the engine. Select the FLOOR mode and the lowest blower speed. Select the warmest temperature setting. Feel the temperature of the inlet and outlet heater hoses at the heater core. Is the inlet heater hose feel significantly hotter than the outlet heater hose? If yes, go to the next step. If no, go to step 17.
  15. Replace the heater core. When the repair is completed, go to step 17.
  16. Check for low engine temperature problems, Repair or replace as needed, go to step 17.
  17. Operate the system in order to verify the repair. If the system operates properly, the repair is complete. If the heater still does not work properly, repeat the entire procedure.
Air Door Actuators/Motors Removal & Installation Recirculation Actuator To Remove:
  1. Remove the right lower instrument panel (I/P) insulator.
  2. Remove the glove box assembly. Recirculation actuator (Typical) gm-10-00-3695.gif

  3. Remove the mounting screws and recirculation actuator from the HVAC module assembly.
  4. Disconnect the recirculation actuator harness connector.
To Install:
  1. Align the recirculation actuator slots with the flats on the actuator door shaft.
  2. Install and secure the recirculation actuator on the HVAC module assembly with the mounting screws.
  3. Connect the recirculation actuator harness connector.
  4. Install the glove box assembly.
  5. Install the right lower I/P insulator.
  6. Calibrate the recirculation actuator.
Mode Actuator To Remove:
  1. Remove the right lower instrument panel (I/P) insulator.
  2. Remove the glove box assembly. Mode actuator gm-10-00-4356.gif

  3. Remove the mounting screws and mode actuator from the HVAC module assembly.
  4. Disconnect the mode actuator harness connector.
To Install:
  1. Align the mode actuator slots with the flats on the actuator door shaft.
  2. Install and secure the mode actuator on the HVAC module assembly with the mounting screws.
  3. Connect the mode actuator harness connector.
  4. Install the glove box assembly.
  5. Install the right lower I/P insulator.
  6. Calibrate the mode actuator.
Air Temperature Actuator Right Side To Remove:
  1. Remove the right lower instrument panel (I/P) insulator.
  2. Remove the glove box assembly. Air temperature actuator (right side) gm-10-00-4356.gif

  3. Remove the mounting screws and right air temperature actuator from the HVAC module assembly.
  4. Disconnect the right air temperature actuator harness connector.
To Install:
  1. Align the right air temperature actuator slots with the flats on the actuator door shaft.
  2. Install and secure the right air temperature actuator on the HVAC module assembly with the mounting screws.
  3. Connect the right air temperature actuator harness connector.
  4. Install the glove box assembly.
  5. Install the right lower I/P insulator.
  6. Calibrate the mode actuator.
Left Side To Remove:
  1. Remove the left lower instrument panel (I/P) insulator. Air temperature actuator (left side) gm-10-00-4357.gif

  2. Remove the mounting screws and left air temperature actuator from the HVAC module assembly.
  3. Disconnect the left air temperature actuator harness connector.
To Install:
  1. Align the left air temperature actuator slots with the flats on the actuator door shaft.
  2. Install and secure the left air temperature actuator on the HVAC module assembly with the mounting screws.
  3. Connect the left air temperature actuator harness connector.
  4. Install the left lower I/P insulator.
  5. Calibrate the mode actuator.

Oct 18, 2010 | 2006 Pontiac Grand Prix

2 Answers

When I turn the heat on the drivers side only kicks out cold air while the passenger side kicks out hot air...


The blend door is not working right or the in car air temperature sensor is faulty.
Removal & Installation Air Inlet Door Vacuum Motor To Remove:
  1. Remove the instrument panel.
  2. Remove the air inlet door motor mounting screws. CAUTION
    Do not attempt to bend any part of the air inlet duct door lever.
  3. Rotate and remove the air inlet door vacuum control motor.
To Install:
  1. Rotate and install the air inlet door vacuum control motor.
  2. Install and tighten the mounting screws.
  3. Install the instrument panel.
Defroster Door Vacuum Motor To Remove:
  1. Remove the passenger air bag module from the instrument panel.
  2. Disconnect the vacuum line and remove the mounting screws. CAUTION
    Do not attempt to bend any part of the defroster airflow mode door lever.
  3. Rotate and remove the vacuum control motor from the defrost door lever.
To Install:
  1. Rotate and install the vacuum control motor on the defrost door lever.
  2. Install and tighten the mounting screws.
  3. Connect the vacuum line to the vacuum control motor.
  4. Install the passenger's air bag module.
Floor Console Register Duct Vacuum Motor To Remove:
  1. Remove the floor console.
  2. Remove the right-side instrument panel insulator.
  3. Working from the passenger's footwell, disconnect the vacuum hose.
  4. Remove the screws and the floor console register duct vacuum control motor. CAUTION
    Do not attempt to bend any part of the floor console register duct door lever.
  5. Rotate and remove the vacuum control motor from the floor console register duct door.
To Install:
  1. Rotate and install the vacuum control motor on the floor console register duct door.
  2. Install and tighten the mounting screws.
  3. Connect the vacuum hose to the floor console register duct vacuum control motor.
  4. Install the insulator under the dash.
  5. Install the floor console.
Panel/Floor Door Vacuum Motor To Remove:
  1. Working through the driver footwell, remove the two screws and the shield. CAUTION
    Do not attempt to bend any part of the airflow mode door lever.
  2. Label and disconnect the two vacuum hoses.
  3. Remove the mounting screw.
  4. Lift, rotate and remove the panel/floor door vacuum control motor from the door lever.
To Install:
  1. Install the panel/floor door vacuum control motor on the door lever.
  2. Install and tighten the mounting screw.
  3. Connect the vacuum hoses in their original positions.
  4. Install the shield on the vacuum motor.
Auxiliary Air Distribution Blend Door Actuator To Remove:
  1. Remove the right rear quarter trim panel access panel. Auxiliary climate control housing removal and installation ford-10-00-4589.gif

  2. Remove the auxiliary air distribution blend door actuator screws.
  3. Disconnect the auxiliary air distribution blend door actuator connector.
To Install:
  1. Connect the auxiliary air distribution blend door actuator connector.
  2. Install the auxiliary air distribution blend door actuator screws.
  3. Install the right rear quarter trim panel access panel.
Auxiliary Temperature Blend Door Actuator To Remove:
  1. Remove the right rear quarter trim panel. Auxiliary climate control housing removal and installation ford-10-00-4589.gif

  2. Disconnect the temperature auxiliary temperature blend door actuator connector.
  3. Remove the temperature auxiliary temperature blend door actuator screws.
  4. Remove the temperature auxiliary temperature blend door actuator.
To Install:
  1. Install the temperature auxiliary temperature blend door actuator.
  2. Install the temperature auxiliary temperature blend door actuator screws.
  3. Connect the temperature auxiliary temperature blend door actuator connector.
  4. Install the right rear quarter trim panel.
--- In-Car Temperature Sensor Removal & Installation To Remove:
  1. Remove the instrument cluster finish panel.
  2. Disconnect the in-vehicle temperature sensor connector.
  3. Disconnect the in-vehicle temperature sensor aspirator tube.
  4. Remove the in-vehicle temperature sensor screws.
  5. Remove the in-vehicle temperature sensor.
To Install:
  1. Install the in-vehicle temperature sensor.
  2. Install the in-vehicle temperature sensor screws.
  3. Connect the in-vehicle temperature sensor aspirator tube.
  4. Connect the in-vehicle temperature sensor connector.
  5. Install the instrument cluster finish panel.
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Oct 07, 2010 | 2004 Ford Freestar

1 Answer

How to install ac mode actuator on 2003 gmc sierra


prev.gif next.gif Air Door Actuators Removal & Installation Air Temperature Actuator Air Temperature Actuator Replacement gm-10-00-559.gif

To Remove:
CAUTION
Do not apply power to the actuator when it is removed from the HVAC module.
  1. Remove the instrument panel hush panel.
  2. Disconnect the connector from the air temperature actuator.
  3. Remove the air temperature actuator mounting screws.
  4. Remove the actuator from the HVAC assembly.
To Install:
  1. Position the air temperature actuator on the HVAC assembly.
  2. Install the actuator mounting screws.
  3. Install the electrical connect to the air temperature actuator.
  4. Install the instrument panel hush panel.
Right Side Air Temperature Actuator (2003-2007) Right Air Temperature Actuator Replacement gm-10-00-560.gif

To Remove:
CAUTION
Do not apply power to the actuator when it is removed from the HVAC module.
  1. Remove the instrument panel carrier.
  2. Disconnect the connector from the right air temperature actuator.
  3. Remove the actuator mounting screws.
  4. Remove the right air temperature actuator.
To Install:
  1. Position the right air temperature actuator on the HVAC assembly.
  2. Install the actuator mounting screws.
  3. Connect the electrical connector to the actuator.
  4. Install the I/P carrier.
  5. Calibrate the actuator.
Left Side Air Temperature Actuator (2003-2007) Left Air Temperature Actuator Replacement gm-10-00-561.gif

To Remove:
CAUTION
Do not apply power to the actuator when it is removed from the HVAC module.
  1. Remove the I/P insulator panel.
  2. Disconnect the connector from the left air temperature actuator.
  3. Remove the actuator mounting screws.
  4. Remove the left air temperature actuator.
To Install:
  1. Position the left air temperature actuator on the HVAC assembly.
  2. Install the actuator mounting screws.
  3. Connect the electrical connector to the actuator.
  4. Install the I/P insulator panel.
  5. Calibrate the actuator.
Mode Actuator Mode Actuator Replacement gm-10-00-562.gif

To Remove:
CAUTION
Do not apply power to the actuator when it is removed from the HVAC module.
  1. Remove the floor air outlet from the floor duct.
  2. Remove the center console and center console duct (if equipped).
  3. Disconnect the electrical connection at the mode actuator.
  4. Remove the mode actuator mounting screws from the HVAC module.
  5. Remove the mode actuator with the actuator cam attached.
To Install:
  1. Position the mode actuator with the actuator cam to the HVAC module.
    • Align the heater/defroster valve lever with the cam slot
    • Align the A/C valve lever with the cam
  2. Install the mode actuator mounting screws.
  3. Connect the mode actuator electrical connection.
  4. Install the center console duct and the center console (if equipped).
  5. Install the floor air outlet duct extension to the floor air duct.
  6. Calibrate the actuator.
Air Inlet Actuator/Recirculation Actuator Delphi Recirculation Actuator Replacement (Delphi) gm-10-00-564.gif

To Remove:
CAUTION
Do not apply power to the actuator when it is removed from the HVAC module.
  1. Remove the instrument panel upper trim panel.
  2. Remove the instrument panel lower trim panel and glove box assembly.
  3. Remove the passenger side air bag.
  4. Disconnect the connector from the recirculation actuator.
  5. Remove the recirculation actuator mounting screws.
  6. Remove the recirculation actuator from the HVAC assembly.
To Install:
  1. Position the recirculation actuator on the HVAC assembly.
  2. Install the recirculation actuator mounting screws.
  3. Connect the electrical connector to the recirculation actuator.
  4. Install the passenger side air bag.
  5. Install the instrument panel lower trim panel and the glove box assembly.
  6. Install the instrument panel upper trim panel.
  7. Calibrate the actuator.
Visteon Recirculation Actuator Replacement (Visteon) gm-10-00-566.gif

To Remove:
CAUTION
Do not apply power to the actuator when it is removed from the HVAC module.
  1. Remove the HVAC module assembly.
  2. Remove the evaporator core cover from the HVAC module.
  3. Remove the recirculation actuator from the HVAC module assembly.
To Install:
  1. Position the recirculation actuator on the HVAC assembly.
  2. Install the recirculation actuator mounting screws.
  3. Install the evaporator core cover to the HVAC module.
  4. Install the HVAC module assembly.
  5. Calibrate the actuator.
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Jul 09, 2010 | 2000 GMC New Sierra 1500

1 Answer

Location and removal of the air vent actuator. step by step on how to get to it and replace it. Air blows and I can control hot and cold but I cant change from floor to vent to dash. It just keeps blowing...


Removal & Installation
  1. Remove the floor air outlet duct extension from the floor duct.
  2. Remove the center console, if equipped.
  3. Remove the screws from the center console duct, if equipped.
  4. Remove the center console duct, if equipped.
  5. Disconnect the electrical connection at the mode actuator.
  6. Remove the mode actuator mounting screws from the HVAC module.
  7. Remove the mode actuator as an assembly with the actuator cam.

98d9332.gif
Mode actuator location

To install:
  1. Install the mode actuator as an assembly with the actuator cam.
  2. Line up the heater/defroster valve lever with the mode actuator cam slot.
  3. Line up the A/C valve lever with the mode actuator cam.
  4. Install the mode actuator mounting screw to the HVAC module and tighten to 14 inch lbs. (1.6 Nm).
  5. Connect the electrical connection at the mode actuator.
  6. Install the center console duct, if equipped.
  7. Install the screws to the center console duct, if equipped, and tighten to 14 inch lbs. (1.6 Nm).
  8. Install the center console, if equipped.
  9. Install the floor air outlet duct extension to the floor air duct.
  10. Calibrate the HVAC module actuators.

Apr 18, 2010 | 2004 Chevrolet Tahoe

1 Answer

Instructions replace blend door actuator 2003 chevrolet suburban


You would have to take the rear trim quarter panel off to get at it . If you are taking about rear Heat - A/C . It's not under the dash ! Aux heat A/C has it's own unit in the back of the vehicle . 2003 Tahoe No Rear Heat Fix Suburban Yukon XL Repair This is to show where it is located , not to fix a no heat problem . How to get to the
Auxiliary Air Temperature Actuator
The auxiliary air temperature actuator is a 3-wire bi-directional electric motor. Ignition 3 voltage, ground and control circuits enable the actuator to operate. The control circuit uses a 0-12 volt linear-ramped signal to command the actuator movement. The 0 and 12-volt control values represent the opposite limits of the actuator range of motion. The values in between 0 and 12 volts correspond to the positions between the limits.
When the auxiliary HVAC control processor sets a commanded, or targeted, value, the control signal is set to a value between 0-12 volts. The actuator shaft rotates until the commanded position is reached. The module will maintain the control value until a new commanded value is needed.

Mar 28, 2017 | 2004 Chevrolet Suburban

2 Answers

2004 Ford Expedition rear floor cool/heat


03f81ff.gif
Item Part Number Description 1 — Air inlet door 2 — Temperature blend door 3 — Headliner airflow 4 — Auxiliary mode door 5 — Floor airflow 6 18476 Heater core 7 19860 Evaporator core 8 19805 Blower motor
The auxiliary A/C and heating system has the following features:
  • The auxiliary A/C and heating system is functional whenever the instrument panel mounted A/C control is in any position except OFF.
  • The auxiliary blower motor recirculates the air inside the vehicle. Outside air is not available to the auxiliary system.
  • Air is cooled and dehumidified by the auxiliary A/C evaporator core only if the instrument panel mounted A/C control is adjusted to a position that requires A/C compressor operation.
  • The temperature blend door and the auxiliary mode door are controlled by electric actuator motors.
  • Movement of the auxiliary temperature control between COOL and WARM causes a corresponding movement of the temperature blend door to mix air flowing through and around the auxiliary heater core.
  • Movement of the auxiliary mode control between PANEL and FLOOR causes a corresponding movement of the auxiliary mode door to direct air flow between the panel (headliner) registers and the floor duct.
---------------------------------------
I would say the auxiliary mode door (#4) electric motor is not wokring.

=============================================
Auxiliary Blend Door Actuator —Air Distribution Removal and Installation
  1. Remove the RH quarter trim panel cup holder and access panel.
  1. Remove the screws.
  1. Disconnect the blend door actuator electrical connector.
  1. To install, reverse the removal procedure.

Jan 14, 2009 | 2004 Ford Expedition

2 Answers

Heating system only blows out hot air through the vents


I would look at the air blend doors first, it sound like they are not working or your control in the dash is not working send a signal to them. they work by changing the air from hot to cold or in between.

Avalanche, Sierra And Silverado
  1. Remove the floor air outlet duct extension (1) from the floor duct (2). 0900c152801c9c8a.jpgRemove the floor air outlet duct extension (1) from the floor duct (2)
  2. Disconnect the electrical connection at the blend door actuator (10). 0900c152801c9c8b.jpgBlend door actuator and related components
  3. Remove the blend door actuator mounting screws from the HVAC module.
  4. Remove the blend door actuator as an assembly with the actuator cam. 0900c152801c9c8c.jpgRemove the blend door actuator mounting screws from the HVAC module
To install:
  1. Install the blend door actuator as an assembly with the actuator cam.
    1. Line up the heater/defroster valve lever with the blend door actuator cam slot.
    2. Line up the A/C valve lever with the blend door actuator cam
  2. Install the blend door actuator mounting screw to the HVAC module.
    1. Tighten the blend door actuator mounting screw to 14 inch lbs. (1.6 Nm).
  3. Connect the electrical connection at the blend door actuator (10). 0900c152801c9c8b.jpgBlend door actuator and related components
  4. Install the floor air outlet duct extension (1) to the floor air duct (2).
C/K Series
  1. Disconnect the electrical connector to the mode actuator that is located on the left side of the air distribution case.
  2. Remove the screws.
  3. Remove the adjuster links from the control lever.
  4. Remove the mode actuator.
  5. Adjust the mode actuator by completing the following steps:
    1. Connect the electrical connector to the actuator.
    2. Turn the ignition switch to the RUN position. Allow the self-positioning of the actuator.
    3. Turn the ignition switch to the OFF position.
    4. Remove the actuator from the electrical connection. 0900c152801c9c8d.jpgBlend door actuator-C/K Series
To install:
  1. Install the mode actuator.
  2. Install the screws.
  3. Install the adjuster links to the control lever.
  4. Connect the electrical connector.
  5. Test the circuit operation

Nov 27, 2008 | 2001 Chevrolet Silverado

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