A/C DIRECTIONAL MALFUNCTION

These vehicles have an electronic vent control that tends to malfunction like what you're describing. If you can locate it (Google vent door actuator location 2007 expedition), once you locate it start vehicle. Observe the white circle on actuator. With each vent selection it should turn. If it doesn't respond to each position this is your problem. They normally last about 5years

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Oct 13, 2011 - 30 posts - ‎21 authors
It will not switch into upper vent mode, only have the option to have it all on my ...You mean the switch itself on the dash will not turn physically?

Turning vent knob (defrost, mix, dash,floor,etc.) has no - Fixya

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Turning vent knob (defrost, mix, dash,floor,etc.) has no effect. Posted by Jim Long on Jan 01, 2016. Want Answer 1. Clicking this will make more experts see the ...

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3) Mode of operation knob has no effect (air comes only to floor for example) 4) Rear defog ... The transistor is MPSA56 (bipolar pnp) and you can locate the faulty one easily. It is the .... With the switch turned only to Vent, no air from anywhere?

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I go to the dealer spares department when I have a problem like this and have them show me a picture of the vent system in the car and I point to the bit that I want. Saves a lot of time and energy when you can point to the bit As to how to replace it the break down will also show the area and you can see if there are clips or what to get the bit replaced.

I think the flaps are sticking

The Vent Mode Actuator and its gear that operates the directional door is making the noise. Either the gear is stripped or the door is stuck or the actuator is defective. These parts are hard to get to and will require a mechanic to diagnose.

The heater blend door actuator (motor) is faulty.Replace actuator

When you turn the dial to the floor vents, do you hear anything. You should hear a flap or something move after the dials been turned. There's a flap (direction control) just above the blower behind the passenger side dash. This directs the air to where it's supposed to go. It sounds like yours may have come loose

Most likely cause is a vacuum leak under the hood. The blower door is vacuum driven and controls air flow inside the car. A vacuum leak will cause the door to malfunction and not direct the air where you want it. Check the vacuum lines under the hood, starting at the firewall and working backwards with the air on and look and listen for an air leak.

It could be a vacuum hose leak. With the car running listen for hissing sound either under the dash or under the hood. Or if the car has electric actuators on it one of them may have failed and stuck in place.

Sounds like you have a supply vacuum problem. When you lose supply vacuum to the control head it defaults to defrost.