Question about 2005 Ford F-150

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The temperature control for the heating and air

The temperature control for the heating and air quit working. I can turn the knob but the temperature coming out of the vents is unchanged.

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  • Ford Master
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Sounds like a bad blend door motor common problem. bolted to side of heater box.good luck.

Posted on Oct 05, 2009

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Air will only come out defrost vents


Check your vacuum lines going into the car from the engine compartment dodge have really bad issues with this, could also be vacuum control valve behind dash on evap box.

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The heater control is stuck in the defrost and lower heat position. The knob turns but the air flow remains the same. I can not get panel airflow, full defrost, full heat,ect. Where do I start? The heat...


you are sure the knob is not stripped right ....it all runs on vacuum look underneath and ensure they are all attached to the cluster on the knob as well check the vent itself and that the cable is not kinked preventing operation ..passengers side upper corner

Oct 03, 2009 | 1995 Oldsmobile Cutlass Supreme

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No heat. Blower works fine. Noticed that the temperature control knob is not illuminated. All other knobs are illuminated. The outside/recirc air actuator is working properly.


If the blower is blowing air just fine, but you cannot control the temperature, you need to listen to air coming from the vents while turning the temperature from hot to cold. If you do n ot hear any change in airflow, then you may a temperature door in the dash broken. this is becoming a common problem on the Equinox

Tech JK
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Sep 19, 2009 | 2006 Pontiac Torrent

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The knob turns on the vent control but it does not change the air


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Jul 10, 2009 | 2000 Ford Focus

1 Answer

1995 Honda Accord vent-on releases heat into cab, not air temperature.


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May 07, 2009 | 1994 Honda Accord

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.

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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

No air flow through the rear vents with ac or heat on high


make sure the control knob on the dash is on "RR". This lets the driver control all the vents in the back. The heat only comes out of the floor vents, if you have the knob on the blue dots that represents the air conditioning in which the cool air will come out of the vents up above in the back. There is also an area on the control knob on the dash where you can turn the knob to shut the heat and air conditioning off. If the knob is in this position then you can control everything with the knob up above the seat right behind the driver's seat.

Jan 15, 2009 | 2004 Honda Odyssey

2 Answers

2004 Ford Expedition rear floor cool/heat


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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

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