Question about 2004 GMC Envoy

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A/C VENT MODE DOOR MAKES KEEPS SNAPPING IN FULL A/C (PANEL) MODE

Heater Mode, Bi-Level Mode, and Defrost Mode are fine but in full A/C Panel Mode or in AUTO when Temperature warms up and A/C is trying to provide full cooling through the Panel Vents, there is a continuous snapping noise coming from inside the dash. Suspect the Mode Door Actuator or something blocking the door. Can this be accessed without breaking into the refrigerant system?

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  • Anonymous Mar 23, 2009

    how many tanks of gas freon do I have to add to my 2004 gmc envoy and is easy to put it or is better to take it to a mechanical shop

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Yes you should be able to follow the vent system and see where the outdoor /indoor flap is . this flap may be what you hear

Posted on Feb 03, 2009

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1 Answer

Heat does not blow onto windscreen but blows through other vents - whats wrong


What make an model an year vehicle do you have ? The air blows out of the floor vents an center vents but not defrost ? Possible mode actuator , stuck mode door ! There is a door inside the heater / A/C assembly that directs the air to the desired position . These doors can be moved by a vacuum operated actuator or an electric motor . Sometimes thing's put on the dash end up inside the heater box , fall through defroster vent ! Pens , pencils etc.. Depends on the make vehicle an system , manual , or automatic climate control . Some of the newer vehicles the HVAC system as it is called , the control panel is a electronic control module an can store DTC'S - diagnostic trouble codes !

May 07, 2015 | Cars & Trucks

2 Answers

My heat on blows from the defrost how do i fix?


The heat/vent blend door that is located inside of the HVAC system behind dash..Rarely it is the control however it could be....Some of the vent door issues are recalls on certain vehicles."Also Blend vent door actuators that operate the doors can become inoperable...If it is the door inside the HVAC it will probably take about 8 hours to repair...Most vent doors either stick shut and or break..as well as actuators....Only a Dealer Scanner can tell exactly where the problem is.....

Feb 22, 2015 | 2008 Jeep Liberty

1 Answer

1999 durango vent control switch will not let AC blow threw vents only defrost


Usually this is a problem with the blend doors under the dash. You either have a vac leak, a dead motor, or a faulty door.
The control opens and closes the doors to direct air thru the heater core and evaporator core along with directing air thru the vents.
When a problem occurs, the default position is the defrost vents to make sure the windshield remains clear.
You can do an internet search for "repair durango blend door" for more info.

Jul 29, 2012 | 1999 Dodge Durango

1 Answer

Heater and AC and blower all work fine but it all blows out of defroster vents thats about it , when AC is on it comes out defroster vents,no matter your selection. Heater is the same way.


The HVAC mode selections on these are controlled by an electric stepper motor that receives commands from the BCM (body control module). The BCM decides where the air door should be by looking at where the dash control input is.
Each mode selected has a different resistance level. From low resistance to high resistance: Panel, Bi-Level, Floor, Mix and Defrost, with Defrost as the highest resistance (~100K ohms). A high resistance or open circuit would probably default the system to defrost no matter what position the mode control was set to.
If the control is dirty or there is a connection issue, this could cause this problem. Does playing with the control make any difference?
The BCM can store fault codes with HVAC releated information. The system can be reset and recalibrated with a battery disconnect, this will also erase any fault codes.
I would start by looking at the dash mode control.

Good luck, i hope this helps.

Jun 28, 2011 | 2006 Chrysler PT Cruiser

1 Answer

I have a 1999 Cadillac Eldorado ETC. When I turn the heater on and bring it out the bi-level vents....The driver side blows heat and the passenger side blows ice cold....even with the air cond. turned...


the temperature door inside (there is two one for each side of car) is possibly broken if you turn the blower on low turn the temp on the passenger side from full hot to full cold or vise versa and listen closely for a clicking or snapping sound if this is heard you have a broken door in side then the dash has to come out the air conditioning has to be discharged of refrigerant which has to be done by a facility with a license. if no noise is heard it could be a control head or a motor but the most likely cause is a broken door.

Dec 15, 2010 | 1999 Cadillac Eldorado

1 Answer

Heat blows cold air


The LH models (LHS, Concorde, New Yorker, Intrepid, Vision) do have self-diagnostic capability with the standard type heater controls. I don't know about the Sebring heater controls (my '95 manual doesn't mention it) but if you have the various controlknobs/buttons that I will describe you could give it a try.
There is a rear window defogger that is initiated by a push button with an LED light. That light is the readout, by its blinking. To begin the diagnostic mode, run the vehicle at idle with the controls set as follows: the blower speed knob should be on any position other than OFF, the temperature knob should be set in full COOL, and the mode knob should be set on Defrost mode.
To enter the diagnostic mode, press the defogger switch in for five seconds, until it begins to blink, then release it. It will continue to blink for about 30 seconds while it calibrates. If it goes out, the calibration is OK and you can skip 3 paragraphs to "Position...mix mode" below.
If the light stayed on, switch the mode knob to the MIX (defroster-floor) position. If the light stays on there is a problem with the control head unit.
Switch the mode knob to the FLOOR position, if the light stays on, it indicates a problem in the blend door or the blend door actuator wiring.
Move the knob to the Bi-level (panel-floor) position where a continuous light indicates a problem with mode actuator or circuit.
Position the knob in the MIX mode. The LED light should now flash twice then pause, and continue a two-flash sequence, indicating that the MIX mode is OK.
In the FLOOR mode the light should flash three times, meaning that the FLOOR mode is OK.
In the Bi-Level Mode, a four-flash sequence indicates that mode is OK.
In the PANEL mode the light should flash 5 times to indicate no problems there, and in the recirc-panel mode 6 times and seven times in the recirc Bi-level mode.
The temperature control can be checked by switching the mode knob to Defrost and rotating the temperture knob. If the temperature contol is OK, the light will flash faster the more you turn the temperature knob up, until the light goes out at the hottest setting.
Switch the knob between Panel and Recirc-Panel and watch the recirc door (unit under the dash). Proper operation means that circuit and components are OK.
To get out of the self-diagnostic mode, turn off the blower or push the air conditioning button once.
If this doesn't seem to apply to your control head or you get no response from an LED light for the rear defroster, then the Sebring may not have this capability. Please let me know your results if any

Dec 02, 2010 | 2001 Chrysler Sebring

1 Answer

Temp light flashes when car start up. turn on heater and blows cold air on passenger side, and barely warm on driver side. No blowing air from defroster. Will work occasionally but usually it is this...


Air Door Actuators/Motors Removal & Installation Recirculation Actuator 1996 - 1999 1996 - 1999 HVAC Actuators gm-10-00-1840.gif

To Remove:
  1. Remove the left sound insulator panel.
  2. Disconnect the vacuum hose from the recirculation actuator.
  3. Remove the recirculation actuator from the valve.
To Install:
  1. Connect the recirculation actuator to the valve.
  2. Clip the recirculation actuator to the air inlet.
  3. Connect the vacuum hose to the recirculation actuator.
  4. Install the left sound insulator panel.
2000 - 2005 2000 - 2005 Recirculation Actuator gm-10-00-1559.gif

To Remove:
  1. Remove the instrument panel compartment.
  2. Remove the right sound insulator.
  3. Remove the dash integration module from the bracket.
  4. Remove the 2 dash integration module bracket fasteners and position the bracket to gain access to the recirculation actuator.
  5. Disconnect the electrical connector from the recirculation actuator.
  6. Remove the recirculation actuator.
To Install:
  1. Install the recirculation actuator and torque the fasteners to 12 in-lbs (1.4 Nm).
  2. Connect the electrical connector to the recirculation actuator.
  3. Install the dash integration module bracket and torque the fasteners to 12 in-lbs (1.4 Nm).
  4. Install the dash integration module into the bracket.
  5. Install the right sound insulator.
  6. Install the instrument panel compartment.
  7. Recalibrate the actuator.
Defroster Valve Actuator 1996 - 1999 1996 - 1999 HVAC Actuators gm-10-00-1840.gif

To Remove:
  1. Remove the air distributor assembly.
  2. Unclip the defroster valve actuator from the air inlet.
  3. Disconnect the defroster valve actuator from the valve.
To Install:
  1. Disconnect the defroster valve actuator from the valve.
  2. Clip the defroster valve actuator from the air inlet.
  3. Install the air distributor assembly.
Heater/Bi-Level Actuator 1996 - 1999 1996 - 1999 HVAC Actuators gm-10-00-1840.gif

To Remove:
  1. Remove the air distributor assembly.
  2. Remove the clip and the screws that fasten the 2 halves of the air distributor assembly and separate the air distributor assembly.
  3. Unclip and disconnect the heater/bi-level actuator from the valve.
To Install:
  1. Connect and clip the heater/bi-level actuator to the valve.
  2. Fasten the 2 halves of the air distributor assembly together and torque the fasteners to 13 in-lbs (1.5 Nm).
  3. Install the air distributor assembly.
Temperature Actuator 1996 - 1999 1996 - 1999 HVAC Actuators gm-10-00-1840.gif

To Remove:
  1. Remove the instrument panel assembly.
  2. By snapping the rod out of the valve, remove the temperature valve link rod from the temperature valve.
  3. Disconnect the electrical connector from the temperature actuator.
  4. Remove the temperature actuator.
To Install:
  1. Install the temperature actuator and torque the fasteners to 12 in-lbs (1.4 Nm).
  2. Connect the electrical connector to the temperature actuator.
  3. Start the vehicle.
  4. Set the fan to position to high.
  5. Set the temperature to full hot.
  6. Allow a minimum of 45 seconds for the temperature valve actuator to move to the full hot position.
  7. Move the temperature valve to the full hot position.
  8. Snap the temperature valve link rod into the temperature valve.
  9. Install the instrument panel assembly.
Mode Actuator 2000 - 2005 Mode and Left Air Temperature Actuator gm-10-00-1560.gif

To Remove:
  1. Remove the left side sound insulator panel.
  2. Remove the knee bolster.
  3. Remove the instrument panel cluster. (Automatic HVAC)
  4. Disconnect the electrical connector from the left air temperature actuator. (Automatic HVAC)
  5. Remove the left air temperature actuator. (Automatic HVAC)
  6. Disconnect the electrical connector from the mode actuator.
  7. Remove the mode actuator.
To Install:
  1. Align the mode door levers with the cam slots.
  2. Install the mode actuator and torque the fasteners to 12 in-lbs (1.4 Nm).
  3. Connect the electrical connector to the mode actuator.
  4. Install the left air temperature actuator and torque the fasteners to 12 in-lbs (1.4 Nm). (Automatic HVAC)
  5. Connect the electrical connector to the left air temperature actuator. (Automatic HVAC)
  6. Install the instrument panel cluster. (Automatic HVAC)
  7. Install the knee bolster.
  8. Install the left side sound insulator panel.
  9. Recalibrate the actuators.
Left Air Temperature Actuator 2000 - 2005 Mode and Left Air Temperature Actuator gm-10-00-1560.gif

To Remove:
  1. Remove the left side sound insulator panel.
  2. Remove the knee bolster.
  3. Remove the instrument panel cluster.
  4. Disconnect the electrical connector from the left air temperature actuator.
  5. Remove the left air temperature actuator retaining screws.
  6. Remove the left air temperature actuator.
To Install:
  1. Install the left air temperature actuator and torque the fasteners to 12 in-lbs (1.4 Nm).
  2. Connect the electrical connector to the left air temperature actuator.
  3. Install the instrument panel cluster.
  4. Install the knee bolster.
  5. Install the left side sound insulator panel.
  6. Recalibrate the actuators.
Air temperature Actuator (Manual), Right Air temperature Actuator (Automatic) 2000 - 2005 Right Air Temperature Actuator gm-10-00-1561.gif

To Remove:
  1. Remove the instrument panel compartment.
  2. Disconnect the electrical connector from the air temperature actuator.
  3. Remove the right air temperature actuator.
To Install:
  1. Install the air temperature actuator and torque the fasteners to 12 in-lbs (1.4 Nm).
  2. Connect the electrical connector to the air temperature actuator.
  3. Install the instrument panel compartment.
  4. Recalibrate the actuators.
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Nov 03, 2010 | 1998 Buick LeSabre

1 Answer

Heat does not come out passenger side of the car but comes out drivers side


There is a blend door problem.

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prev.gif next.gif HEATING AND AIR CONDITIONING Refer to Section 1 for discharging and charging of the air conditioning system. The heating system provides heating, ventilation and defrosting for the windshield and side windows. The heater core is a heat exchanger supplied with coolant from the engine cooling system. Temperature is controlled by the temperature valve which moves an air door that directs air flow through the heater core for more heat or bypasses the heater core for less heat. Vacuum actuators control the mode doors which direct air flow to the outlet ducts. The mode selector on the control panel directs engine vacuum to the actuators. The position of the mode doors determines whether air flows from the floor, panel, defrost or panel and defrost ducts (bi-level mode).

Oct 28, 2010 | 1998 Oldsmobile Regency

2 Answers

When I turn my air conditioner on, the air blows out on the dashboard for the windshield and not from the vents. What can I do??


The blend door actuated by solenoids may not be working correctly causing a/c cool air to come out of the windshield vents, rather than the regular front vents.

Defroster Valve Actuator 1996 – 1999 1996 – 1999 HVAC Actuators gm-10-00-1840.gif

To Remove:
  1. Remove the air distributor assembly.
  2. Unclip the defroster valve actuator from the air inlet.
  3. Disconnect the defroster valve actuator from the valve.
To Install:
  1. Disconnect the defroster valve actuator from the valve.
  2. Clip the defroster valve actuator from the air inlet.
  3. Install the air distributor assembly.
Heater/Bi-Level Actuator 1996 – 1999 1996 – 1999 HVAC Actuators gm-10-00-1840.gif

To Remove:
  1. Remove the air distributor assembly.
  2. Remove the clip and the screws that fasten the 2 halves of the air distributor assembly and separate the air distributor assembly.
  3. Unclip and disconnect the heater/bi-level actuator from the valve.
To Install:
  1. Connect and clip the heater/bi-level actuator to the valve.
  2. Fasten the 2 halves of the air distributor assembly together and torque the fasteners to 13 in-lbs (1.5 Nm).
  3. Install the air distributor assembly.
---
Removal & Installation Recirculation Actuator 1996 – 1999 1996 – 1999 HVAC Actuators gm-10-00-1840.gif

To Remove:
  1. Remove the left sound insulator panel.
  2. Disconnect the vacuum hose from the recirculation actuator.
  3. Remove the recirculation actuator from the valve.
To Install:
  1. Connect the recirculation actuator to the valve.
  2. Clip the recirculation actuator to the air inlet.
  3. Connect the vacuum hose to the recirculation actuator.
  4. Install the left sound insulator panel.

Aug 13, 2010 | 1997 Buick LeSabre

1 Answer

Recirclation light blinks on and off and will not stay on anf fan does not blow at full force when it's switch to level 5.


{: ) Regardless of the blower motor switch position, recirculation is available only in the panel and bi-level mode switch positions. Including the OFF position. The mode switch must be placed in either the panel or bi-level position before the blower motor switch is placed in the OFF position. In order to reduce windshield fogging, outside air is circulated when the mode switch is in the defrost or defog positions. If the recirculation switch is pressed into the ON position when the mode switch is in an unavailable mode position, then the recirculation switch LED will flash 3 times. If the HVAC control module detects a fault with the recirc door the HVAC control module will try to drive the actuator for a predetermined amount of time, to outside air, which is the defaulted position for the recirculation actuator.
As for your blower not full force at level 5, check first the BLWR fuse 40A at the underhood fuse block. If its okay, most likely you have a malfunctioning blower motor resistor assembly.

Jul 06, 2010 | 2006 Chevrolet Trailblazer

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