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2008 silverado k1500 4.8L V8 - this fall i noticed that when I went to use my heat, the blend door or temp control knob was not functioning properly, either it kept blowing cold air or would not get hot, hot. After I got the blend door to change I noticed that My driver side vents are hotter than passenger side. I do not have dual climate control. So I used my verdict scan tool to look at temp control specs and they change like they should. Does any1 know where abouts the temp blend door is located? I haven't looked yet bc it's too damn cold and I haven't had time or chance to take a look while at work. Or has any1 else ran into simaliar issue? All other controls work properly.

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Posted on Jan 02, 2017

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SOURCE: driver's side air blowing warm, won't change

Sounds like there is a crack in the vent that leads to the drivers side, and hot air from the engine is leaking through.

Posted on Aug 29, 2009

  • 1 Answer

SOURCE: 99 Buick Regal LS dual climate control. No heat passenger side.

the motor for the passenger side
blend door is shot

Posted on Jan 12, 2010

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Heater blows hot on drivers side cold on passenger side


it depends on what model and what options your Journey is equipped with. if it has a dual zone control climate control, it sounds like the blending actuators are not aligning properly or the blend doors are not adjusting to cooperate with the main climate control system. the temp. of the vehicle is controlled by Blend doors in the h/vac system that is thereby controlled by the body control module of the vehicle. the module is a computer that controls all functions within the body of the vehicle. the module should have problem codes that should isolate the area that needs attention.
the body module controls the blend doors in the h/vac system, the doors that open and close in the vents by the heater core that controls the temperature that is ultimately expelled the correct temperature that comes out of the vents. if the settings on both the drivers and passengers control knobs for example are on cold, and one side is hot and one side is cold, then there is a problem at the module level or most likely the blend door is the problem. most likely the actuator ( the motor that runs the blend door and controlled by the module) is not operating properly. your dealer will hook the module up to a diagnostic computer and retrieve the codes ( if any) and isolate which blend door is not working correctly.

usually its just a blend door actuator that needs replacing. to rule out heater core issues, if there is no excessive condensation on the windows and coolant on the carpet, then most like it's a module or blend door issue. if it's a single mode climate control, the same is true but puzzling b/c in that case, both passenger and driver h/vac system is designed to push out a consistent temp for both side without the option of variation on either side. again most likely a blend door issue.

hope this helps

Mar 04, 2014 | 2009 Dodge Journey

2 Answers

Heater clicking


Usually a sign of a faulty blend door motor or actuator.

Mar 03, 2013 | 2008 Ford Explorer

1 Answer

No in 99 chevy silverado


Sounds like the blend door is not moving. Most blend door actuators are located on the bottom of the heater box near the middle of the car. If the temp control is a round knob, it is an electronic actuator.

Dec 12, 2012 | 1999 Chevrolet Silverado 1500

1 Answer

When i put my control knob on floor for heat, heat comes out of defrost as well.


Your heater box has what is called a blend door in it, this directs the flow of air to its destination selected on the control. Sometimes something can block the door by falling in the vent or the door also has what is called a blend door motor that opens and closes the door. Some of these motors are power and some are vacum. The problem with vacum is the hose sometimes come off. Maybe this will give you a place to start looking. Good Luck, Roger

Feb 08, 2010 | 2002 Chevrolet Silverado 1500

2 Answers

Heater not working properly, doesn't get as warm as it should, fan is working, appears that the control that regulates the flow of air is not working properly


sound like a vacuum leak. you can check this by spraying wd40 very carefilly on the vacuum lines under the hood. the idle will change when a leak is detected. could also be a modulator valve or vacuum line under the dash. check this with a spray bottle filled with water. dont want the smell of wd40 in the cabin

Jan 02, 2010 | 2001 Ford Taurus

1 Answer

Heater not working properly, a/c puts out heat sometimes, but regular heater doesn't.


check your blend door, center of the dash at the bottom remove black cover, its above the white stepping motor, the motor turns the door with temp selection, when the door breaks you have no control over temp selection, check the stepping motor (white square box), by removing it and plug it in, and turn the temp knob does the motor turn, if not verify power in the plug and replace motor, if so use an inspection mirror and look at the bottom of the blend door (where motor mounts) see if it is broken. If the door itself is broken, this is a large repair, you will have to remove the entire dash from left to right to access the environmental station which is where the blend door is located. Hope this helps, let me know

Dec 14, 2009 | 1999 Ford Expedition

2 Answers

1999 Silverado - cannot get the temperature to switch from cool air to warm air when turning the knob to heat.


The temp blend door, or blend door actuator may be faulty. You can check this by watching the movement of the blend door actuator while you turn the temp selector knob. If the actuator is working, then it may be the blend door, or blend door lever broken. If these are ok then the control head may be faulty.

Oct 18, 2009 | 1999 Chevrolet Silverado 1500

1 Answer

No heat Heater core is hot


If heater core is getting coolant circulating through it then you may have a temp blend door, or blend door actuator not working properly. The blend door is located in the air box under the dash, and the actuator is located on the air box. You may be able to visually check the operation while turning the temp knob, by locating the coresponding actuator on the air box and monitoring the movement. If it is moving ok and still no heat then the blend door, or lever is broken, which will require removal of the dash.

Oct 17, 2009 | 2001 Dodge Ram 2500 Truck

1 Answer

I have the same problem with my windstar blower is fine but is coming cold air but no heat i dont know what to do can any one show me how to fix it thnx


First, feel the heater hoses going into the firewall under the hood. If they are hot, then you have hot engine coolant going into the heater core. If they are not hot, then you either have a bad thermostat or you are very low on engine coolant.

Next you need air flowing through the heater core so it can come out heated through your vents. If the iar is flowing somewhere else, your temp blend door is not moving because the bend door motor is bad or your temp knob on your heater controls is bad. The blend door motor is an electric motor.

------------------------------------------------
Air Flow Control
Air flow control is accomplished in the following manner:
  • Primary control is through the function selector knob , mounted on the heater function selector switch, which is part of the heater control .
  • The function selector knob has the following positions: OFF, PANEL, PANEL/FLOOR, FLOOR, FLOOR/DEFROST and DEFROST.
  • The heater function selector switch combines a vacuum selector valve with an internal electrical switch.
  • The vacuum selector valve directs source vacuum to various vacuum control motors (18A318) . Refer to the System Airflow Schematic and Vacuum Control Charts.
  • An internal single-pole electrical switch is also controlled by the selector. The switch controls the electrical supply to the heater blower motor switch (18578) .
  • The position of the function selector knob determines the manner in which the system will operate.
  • Each position of the function selector knob is detented for positive engagement.
Temperature Control
The temperature control operates in the following manner:
  • Temperature control of the heater system is determined by the position of the temperature control knob (between COOL-BLUE and WARM-RED) of the heater control .
  • This control knob is connected to a potentiometer mounted in the heater control . This potentiometer is electrically connected to the electric blend door actuator that operates the A/C air temperature control door.


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  • Movement of the control knob from COOL (Blue) to WARM (Red) causes a corresponding movement on the air temperature control door and determines the temperature that the system will maintain.
System uses a reheat method to provide conditioned air to the passenger compartment.
  • All airflow from the blower motor (18527) passes through the A/C evaporator housing .
  • Temperature is then regulated by reheating a portion of the air and blending it with the remaining cool air to the desired temperature.
  • Temperature blending is varied by the air temperature control door, which regulates the amount of air that flows through and/or around the heater core (18476) , where it is then mixed and distributed.
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inside you plenum box:

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Mar 03, 2009 | 1998 Ford Windstar

1 Answer

1999 1500 silverado heater


Sounds like the blend door in the ducting has failed, this door is what controls the temp of the outlet air by blending heat and outside air or AC cooled air.

Nov 01, 2008 | 1999 Chevrolet Silverado 1500

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