Question about Ford F-150

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I have 2003 F-150 Supercrew with 5.4 liter. Air comes from my defrost vent when I turn on the A/C, heat floor, vent, etc.

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The air is distributed from the heater/ac evaporator box to the vents with the help of some pipes.These pipes are opened and closed by flaps, that are controlled either by the environmental control unit - the AC controller in a digital model, or a rotary control button. The air goes where it's not supposed to because there's a fault in the system:either the controller of the flap is defective or it's badly commanded by the ac unit/ button.
First of all you need to have the error codes read. If none are present the you will have ta remove the center console and check if the controller is doing its job: the button moves the wire or the ac controller sends the power to the solenoid on th flap.
Finally you will have th check that the solenoid (or the cable attached to the flap) is doing its job.

Posted on Sep 15, 2010

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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.

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Ac vents not working


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Air, either heated or cooled only comes out the dash vents, cannot redirect air to any other vents.


The most common cause of your problem is the blend door actuator. This controls air flow from defrost, vent, floot etc. In most cases, replacing the blend door actuator will fix your problem. It's commonly located above or behind the heater vents on the floor of the cabin.

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02 SILVERADO. AIR ONLY BLOWS OUT DEFROST VENTS. REPLACED CONTROL PANEL. NO LUCK


I had a similar issue on an 05 silverado. Air would only blow out of defrost vents. But this worked for me:

1) Unplug HVAC fuse for 10-30 seconds
2) Start truck
3) A/C comes out defrost - wait about 10 to 15 secs
4) A/C then starts coming out the floor vents for about 5 seconds
5) A/C then starts coming out the dash vents.
6) While the A/C is coming out the dash vents, turn A/C OFF (otherwise it cycles back to defrost for good).
7) Turn truck OFF
8) Restart truck and it should work fine

(Found solution on another forum from user "ccurran")

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1 Answer

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behind the center counsel between the floor and the heater housing is a part that is called the blend door actuator. these usually go bad and have to be replaced.

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1 Answer

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