Question about 2001 Ford F150 Styleside SuperCrew

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My AC will not stay on the panel ducts. It moves back and forth from panel to defrost and floor. Whats wrong

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This sounds like a vacuum line problem from the HVAC control to the panel mode controller. Chances are the correct setting works when you have vacuum ( less than 50% throttle ) and when you press the throttle down, the panel mode changes.

Posted on Jul 20, 2010

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Posted on Jan 02, 2017

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Defrorstores stay on ,try to change to floor, ac, heat vent ,deforstores still on 1995 thunderbird lx blower motor works great.


Some cars use vacuum from the engine to open and close the doors that direct the air to different positions. It is possible that the vacuum line to the controls is cracked or disconnected.

Apr 29, 2015 | 1995 Ford Thunderbird

1 Answer

Air flow issue- intermittently blows from wrong vents


This is a common problem on this site.
In your case I would look for a vac leak or a sticky blend door.
Since the direction of air flow changes when you are accelerating, I'm going to guess the blend door or doors are controlled by engine vacuum. There may be a vac leak between the dash and the engine, or the blend door may not be able to move back and forth correctly.
Defrost is the default position when a problem occurs, to make sure the windshield is clear of fog or frost.

Jul 19, 2012 | 2005 Mazda Tribute

1 Answer

Ac vents not working


There is a blend door acuator which moves when u change your settings. Its a electric motor. Down under dash, Will need a mech and a heating and cooling diagram to find where the motor is,

Jun 13, 2012 | 2007 Ford Sport Trac Limited

1 Answer

I have a 97 chevy k2500 the fan works, heat and ac works, the floor vents and dash vents work but cant get any air to blow out of the defrost vents. help i have replaced the control panel, still have...


Your vehicle uses electronically controlled blend doors to direct th air flow from defrost to vent and to the floor . If the door motor is bad then it will stay at a fixed position so you will not get the air to flow out the defrost ducts. There are at least two of these one for air blend and one for fresh air. They are located on the passenger side usually under the plastic cover and have a wire harness that plug in and are usually shaped like a piece of pie.

Mar 03, 2011 | 1997 Chevrolet K2500

1 Answer

Ac system goes to the defrost vent when on max ac or regular ac sometimes moves to floor area


Heater ducting is designed to fail in defrost mode. Look for lose or leaking vacuum hoses. The you investigate the controls, then the heater / A/C box...

Sep 17, 2010 | 2008 Mercury Grand Marquis

2 Answers

2003 pontiac grand am , The ac is blowing out of the defrost and the front and floor, the controls when switched does not adjust what is wrong with it


The condition you have is cause by the "mode" door stopped in the default position. Your control switch is not telling the door to move or the door motor can't move because it is stuck or defective. A good repair shop or your local dealer will be able to fix it for you.
Good luck.

Jun 21, 2010 | 2003 Pontiac Grand Am

1 Answer

My ac stays on defrost or floor until i drive for


The climate control module has a vacuum leak inside. It can be repaired but it is unlikely that you will find someone to tear it appart and do it. You will most likely have to replace the module.

Nov 14, 2009 | 2004 Ford Crown Victoria

2 Answers

I have a mercury mountaineer 2003 V6. It has a problem of making sound repeated when I want to have heat turned on. No sound when the dashboard A.C/Heat stays at AC level, which is the zero? level. The...


When the engine is cold,check the coolant level.

Make sure it's on max.

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A coolant system should be flush every two years.

===

If you did a coolant flush recently then air pocket can be the cause of the un-even heating problem.

The DIY method is to drive you car onto a ramp or a steep hill.

Iet the engine cool off and top off the coolant tank.

Set MAX heat + MAX fan

Let the engine ran for 20 minutes wih the cap off and the trap air will escape from the coolant reserve tank,

Check coolant level and top off coolant when the engine cools down.



A shop will charge $75+ for this but using an air operated excavate tool!

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A car with over 90K miles may experience linkage problem to the heater control valve.

The heater control valve (near the firewall) may be stick over time.

Open the hood and move the heater to max and min. Back and forth.

Clean and lube the linkage with WD-40 to free the heater control valve.

If it's a vacuum type heater control valve then cash for leaky vac. hoses.


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Move the fan switch back and forth to re-new the electrical conductors.

Pass a vacuum over the control panel to prevent dust build up behind the console.

Sep 13, 2009 | 2003 Mercury Mountaineer

1 Answer

Air only comes out of defroster duct. Will not


vacuum hose or motor. Find a junkyard and replace if you are comfortable doing so. if not your heater controls are busted. Also check first if there are related fuses, as this is sometimes the case.

Aug 16, 2009 | 1999 Ford Expedition

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