Question about 1994 Pontiac Grand Am

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Fan air does not switch to defrost vents. Always coming out face vents.

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If stuck on only one setting, most likely vacuum line from engine to controls broke (usually from engine heat) its a small rigid hose running from engine block and enters through fire wall into cabin

Posted on Sep 10, 2009

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Vents won't blow hot or cold air. Comes from defrost and feet when you put fan on.


It's the vent actuator, it moves the baffle that changes the direction of the air flow.
Here is a video of a broken vacuum hose that creates the same problem.

It could also be a failed actuator.

Sep 19, 2016 | 1997 GMC Safari

1 Answer

AC is only blowing through the defrost vents in the dashboard?


I think your problem is the head unit that selects where the air comes out ie. Face, floor, defrost, or hi-level face and floor. If that's not working then it will not let you switch location that you want the air to come out.

Jul 26, 2012 | 2003 Chevrolet Tahoe

1 Answer

Fan blowing warm air only, and only through the defrost vents


Had the problem been solved after you replaced the damper door switch and had the gas checked in the ac system??

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Jun 27, 2012 | 2003 Ford Taurus

1 Answer

88 nissan 300 zx ss fan and ac are on but only heat comes out.also sometimes it only goes threw the defrost and none to the floor or face vents


Check when you activate the hot cold switch that the heater tap is actually moveing. Your heater may be stuck on

Jun 27, 2012 | Cars & Trucks

1 Answer

2003 Trailblazer No air from front face vents


first check to see if you have power going to the actuators when you switch the switch to it location if no power replace controller if you have power and no movement from actuators replace actuator. if actuators move remove hvac box and check for broken blend doors.

Jan 22, 2010 | 2003 Chevrolet TrailBlazer

1 Answer

I have a 93 Saab and my vents aren't blowing heat. When I hit a bump in the road it may kick my heat on full blast for a couple of minutes, but as soon as I hit another bump, the heat kicks off. Also, the...


You don't say whether the fan starts and shuts off with the bumps, or the heat goes cold but the fan stays on. If it's the fan shutting off and coming back, you most likely have an intermittent connection to the blower motor somewhere at the fuse box, the fan speed control switch or the fan motor, or a loose ground connection at the fan motor. The fan motor is visible under the right side speaker grille on the dash. Make sure you re-connect the short black corrugated hose to the grill vent or you won't have defrosting on that side!

The air distribution rotary switch controls where the air goes. The fan speed switch controls exactly that: fan speed. the temp rotary switch controls the coolant temp into the heater core. You need to clarify what you mean by "Also, the dash controls for the vents won't allow me to turn up the power"

You might also have one or more of the following issues:
  1. is you vacuum tank properly connected and are there no leaks in the vacuum piping? The tank is in the driver side rear wheel well below the trunk deck on a convertible, and in the passenger side front fender area on the other cars. It's a white bottle with one or two hoses connected to it. If not properly on, your vacuum operated heater flaps won't move. Does the air distribution knob make sucking or hissing noises when you set it to different positions? If not, check the tank connections, look for vacuum line leaks, then suspect the vacuum valve behind the distribution knob.
  2. if the air distribution rotary switch makes noises when you change its setting, but nothing happens, then suspect the vacuum solenoids that open and close the heater flaps - could be a loose vacuum line or a defective vacuum solenoid
  3. the shaft connecting the temp control knob to the heater valve behind it may not be properly in place. This can be inspected, and adjusted if necessary, from the left side speaker/vent cutout on top of the dash. Make sure you re-connect the black flex hose to the air vent tube, or you'll get no defrosting afterwards!
  4. remember, the centre vents always blow cold air; a brilliant idea from Saab so the driver (and passenger) can get fresh air in the face and stay awake while the rest of the driver, passenger and car is toasty!

Oct 26, 2009 | 1993 Saab 900

1 Answer

No air flow out of face vents.


no, should be a acuator motor that does that

Jun 29, 2009 | 1996 GMC Sonoma

3 Answers

AC will not come out the dash vents all the time. Can lower the fan speed really low and they will sometimes switch back to the dash. All air is coming out the defrost vent.


my ac vent only comes out of the defroster and the floor i replaced the vent door accuator but that didnt work what could be the problem 2004 gand marquise

Jun 21, 2009 | 2004 Mercury Grand Marquis

2 Answers

2005 Dodge Dakota AC and Heater both dead but the blower works!


I would suggest changing the control head. You should be able to source a used unit from a local salvage yard.

Apr 28, 2017 | 2005 Dodge Dakota

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