Question about 2003 Ford F150 Regular Cab

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2003 F-150 air conditioner won't select panel vents. Air is cold but stays on defrost vents, for a long time. Eventually switches at stoplight. Any ideas?

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  • Bob Dick May 08, 2010

    This is an automatic temp system.

  • Steve S
    Steve S May 11, 2010

    Is this a Manual or Automatic temperature control system ?

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  • 181 Answers

Sounds like you may have some sort of vacuum leak to the control head or a faulty control head. Actuators are vacuum operated.

Posted on May 06, 2010

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1 Answer

99 air conditioner switch


im not sure what fails here.
no air, from all vents. no cold air , no hot air.
tell me what you want.? hot or cold air. (or defrost)
does the blower blow on high?
did you check all fuses. 1st.
if real serious. on DIY repairs, try the FSM.
or a great subs. alldata.com

Jan 01, 2014 | 1999 Toyota Camry

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Air conditioner blows out defrost vents when acceleration.


In f150 truck there is a small vacum hose passenger side up by the windshield. It's a small hose check really good they dry rot and it will cause your vents to switch. Also if your box is bad. It's next to the battery

May 02, 2012 | Ford F-150 Cars & Trucks

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Ice formed on outside of line!


try running the air conditioner in defrost mode. set the temperature to warmest while air conditioner is on, for about two minutes. then slowly move the lever towards cold, all the while having the vent set on outside air. once you move it toward cooler, move the vent switch towards recirculate from outside air.

when you have it on defrost, open the engine hood and push the air conditioner button. watch the lines and see if they begin to build frost. if not, move the slider toward cold a little bit at a time while watching the lines to see if they begin to build frost. if they do start to build frost at any point after running the defroster in A/C mode for a bit, you can always try positioning the temperature control towards the middle or run only the outside instead of recirculating vent.

Jan 18, 2011 | 1998 Ford Escort

1 Answer

Air flow to defrost or floor not switching stays on dash vents


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Oct 06, 2009 | 2001 Chevrolet Silverado

1 Answer

2004 Odyssey, heat and A/C do not work unless van in motion


Since warm air eventually comes out when the vehicle is in motion, you may have an air mix door that is stuck in fresh or is somehow blocking warm air from the heater core.

To see if the air mix control motor is bad, you need to retrieve your Diagnostic trouble codes (DTC's) from the heater control panel. To run the diagnostic function, do the following:
1. Turn the ignition switch ON (II).
2. Turn the fan switch OFF.
3. Press the recirc control button to select Recirc (recirc light on.)
4. Press and hold the recirc button to select Fresh (recirc light off) and continue to hold the button down until the recirc light comes on for two seconds and then goes off.
5. If the system is okay, the recirc light stays off.
6. If there is a problem, the recirc light blinks the DTC to indicate the trouble. One blink=a problem in the air mix control motor circuit. Two blinks=problem in the mode control motor circuit
Three blinks=problem in evaporator temp sensor circuit.
7. Turn the ignition switch off to cancel the self diagnosis function. Run the diagnostic again after repairs are complete.

Note: the air mix control motor has a rod which connects to a plastic link. The link controls the mix doors and also connects to the heater control water valve via a cable. The air mix motor may check okay, but if the link is broken then you will still have problems. the motor is on the bottom of the heater unit in the front passenger's foot well.

May 10, 2009 | 2004 Honda Odyssey

1 Answer

Heat wont blow through heater or defroster vents


common problem, check under dash by the gas pedal if control arms are muving went selecting from ac to heat cuz this it is the control for the vents to go from ac to heat and to defrost.

Jan 18, 2009 | 1997 Chevrolet K1500

1 Answer

Air conditioner staying on...


Many cars use air conditioning as part of the defrost function. Cold air will clear windshield faster than hot air.

Aug 01, 2008 | 2001 Honda Civic

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