Question about 2004 Infiniti QX56

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Air condition vents do not open in the middle.

Air flow at defrost and feet but not in the middle. blower blows at level 5.

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  • 25 Answers

Sounds like a blend door problem need to see if all vac. line are hooked up under dash

Posted on Jun 25, 2009

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Posted on Jan 02, 2017

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Need pitcure of vaccum lines on 1999 Ford Ranger v6 3.o air and heat blows only threw the defroster.


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Item Part Number Description 1 18A318 Vacuum Control Motor-, Panel/Defrost Door 2 18A478 Panel/Defrost Door (Full Vacuum Position) 3 - Defrost Air Flow 4 - Side Window Demister Air Flow 5 18B545 Temperature Blend Door (Full Heat Position) 6 19860 A/C Evaporator Core 7 19A813 Air Inlet Duct Door (Full Vacuum Position) 8 - Outside Air Inlet 9 18A318 Vacuum Control Motor-, Air Inlet Duct Door 10 - Recirculated Air Inlet 11 18527 Blower Motor 12 19A566 A/C Vacuum Reservoir Tank and Bracket 13 - Vacuum from the Engine Intake Manifold 14 19B888 A/C-Heater Function Selector Switch 15 - Vacuum to the 4x4 Hub Solenoids 16 18495 Water Diverter Valve (Full Vacuum Position) 17 18476 Heater Core 18 18A559 Floor/Panel Door (Full Vacuum Position) 19 - Floor Air Flow 20 18A318 Vacuum Control Motor-, Floor/Panel Door 21 - Panel Vent Air Flow

Dec 09, 2016 | Ford Ranger Cars & Trucks

2 Answers

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

Why does my 1993 buick roadmaster heat fine but most times the blower won't blow on my windshield to defrost?


Are you referring to the blower NOT blowing air or it is blowing air but will not direct the flow to defrost?

Aug 22, 2015 | 1993 Buick Roadmaster

2 Answers

Ac air does not come out on the dash boared vent but blows on windshield. what is the problem?


there will be a air flow setting knob that controls whether air is defrost or on feet or from the console vents.

Feb 07, 2015 | 2001 Lexus RX 300

1 Answer

Low air flow to feet when heat is on ?


Sounds to me that you might have a leak in the line. Those heaters are all Vacume actuated.

Feb 18, 2014 | 2000 Oldsmobile Intrigue

1 Answer

Defrost isn't blowing air


ur r going to have to check the button or the release lever that alouds u to move the air to the other positions sometimes that's the problem

Nov 29, 2013 | 1996 Volvo 850

1 Answer

The blower on my a/c on 2002 chevy trailblazer only blows from the floor vents and the defroster vents but not the dashboard vents how can this be fixed. Also, it only works on 5


It sounds like you have two problems. First a question though; Is your heating and air conditioning control on the dash automatic (has two knobs that rotate and a display screen in the middle), or manual (has two levers that move up and down for driver/passenger temp and a separate fan knob and mode knob).

In response to the vents being stuck on defrost and floor, from experience i can say that the most likely cause is the mode actuator has failed. If your battery has recently gone dead, that could have brought the problem to the surface. When the battery has gone dead, the heating and air conditioning controls relearn all the positions of the actuators behind the dash when the vehicle has been re-started. If there is a position sensor failing (which happens quite often) in one of the actuators, the heating and air conditioning controls won't be able to learn the correct position of the actuator and (in your case) defaults to the defrost/floor position.

The only way to fix that would be to replace the actuator. I would like to know what type of heating and air conditioning controls you have (manual or automatic) before i say anything on the blower only working on 5.

Aug 05, 2011 | 2002 Chevrolet TrailBlazer

1 Answer

AC/Heat/Defrost inoperable


Chanses are its either the blend door motor quit working or the controls ( temp., selector, blower) in dash are bad, my 95 did the same thing i chg. the blend door motor thinking it was that, but it turned out to be the controls in the dash, 5 minutes work and 140.00 later it was fixed.

Jan 12, 2010 | 1999 Chevrolet Silverado 1500

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