Question about 2004 GMC Yukon

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Airconditioner blower is stuck on defrost in dash, can not switch to floor or front air.

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  • Kim Kinder Oct 14, 2010

    hose is not off? any other solutions????

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YOU HAVE A VACCUM HOSE OFF CHECK UNDER DASH ON PASSENGER SIDE PEOPLE WILL KICK THE HOSE LISTEN FOR VACCUM LEAK OR CHECK UNDER HOOD

Posted on Oct 14, 2010

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Posted on Jan 02, 2017

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1 Answer

My air runs cold but is stuck between defrost and front vent. How to fix


Pull the control panel out of the dash and see if the mode control vacuum switch has a good vacuum source or the switch itself leaks vacuum. The mode control is what moves the doors that diverts the air flow around to the vents, defrost and floor.

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1996 Montero Heater Blower not working


I assume your heater setting is electric control, if so either your defrost and floor heat switch failed or wire problem. For the air not hot, check the heat control valve on the top of the hose it should be in front of the firewall. I don't know your car is using mechanic valve or electric control valve. Anyway check there first. Good luck.

Nov 24, 2013 | 1996 Mitsubishi Montero

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I have a 06 Jeep Commander and the blower is working and blowing heat it will not switch to defrost, floor, front, on the switch?


Sounds like a vacume leak Probably need to pull trim on dash and listen for a rush of air but first listen under hood

Apr 18, 2013 | 2006 Jeep Commander

1 Answer

My ac unit is working but will not blow air out of the dash vents. The blower is working


Hey man if the blower is working and air is coming from your other vents i have a few ideas.First i would start by checking your vent selection switch something may be stuck where the dash vents open. If the selector is fine you should try checking the ducting behind the dash it could have come apart or simply be cloged where it routes air to your dash. hope that is helpfull.

Aug 11, 2012 | 2004 Chevrolet Tahoe

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

Climate Control - Heat and cool work fine. Air flow is directed to defrost /floor. No indication (Sound or sight) that the vacuum diaphrams are being activated. The display on the dash matches the...


Does your vehicle have manual or automatic climate control ? You system is stuck in floor an defrost mode ?

03 mercury grand marquis hvac air flow .-13qahwfdndst2y1hypmr2cdq-4-0.gif Item Part Number Description 1 18A318 Vacuum control motor-floor/defrost door 2 - Defrost air flow 3 18A478 Floor/defrost door 4 18476 Heater core 5 19860 Evaporator core 6 19805 Blower motor 7 - Outside air inlet 8 19A813 Air inlet door 9 18A318 Vacuum control motor-air inlet door 10 - Recirculated air inlet 11 18B545 Temperature blend door 12 18A559 Panel door 13 - Panel air flow 14 18A318 Vacuum control motor-panel door 15 - Floor air flow 16 - Vacuum from the engine intake manifold 17 19A563 A/C vacuum check valve 18 19A566 Vacuum reservoir tank and bracket 19 19980 EATC control
Pull the control panel an check for vacuum

vacuum lines hvac 03 grand marquis-13qahwfdndst2y1hypmr2cdq-4-2.gif Item Part Number Description 1 White Air inlet door 2 Yellow Floor/defrost door 3 Red Floor door 4 Blue Panel door 5 Black Source vacuum 6 - Not used


VACUUM APPLICATIONS CHART-ELECTRONIC AUTOMATIC TEMPERATURE CONTROL Switch Port Vacuum Harness Hose Color Func- tion Manual Override Selector Buttons OFF MAX A/C NORM A/C VENT FLOOR FLOOR/ DEF DEF 1 White Air inlet 2 Yellow Floor/ panel (partial) 3 Red Full floor 4 Blue Panel 5 Black
Source

May 21, 2017 | 2003 Mercury Grand Marquis

1 Answer

My AC air registers only have air coming out of the defrost ducts


In every car, there are fins or flaps inside the dash that rotate that distributes the air flow from the blower to the desired opening, ie defrost, floor etc... This flap is controlled by a linkage which is connected to the selector switch. It may be the linkage is no longer connected, or the fins inside the dash are stuck. If the selector switch moves freely with little or no resistence its possible the linkage is no longer connected, otherwise the flaps need to be physically looked at.

Aug 09, 2009 | 1989 Ford F 150

2 Answers

When i have the heater/defroster on the heater below blows cold air while the defrost blows hot. when i switch to just defrost the bottom heater stays on and blows cold air. when i have front dash and...


It sounds like you have a blend air door stuck. This is in the housing of the heater a/c blower unit under the passenger side of the dash. There is a motor on the top of the housing that could possibly be stuck or on working.

May 10, 2009 | 2003 Dodge Durango

1 Answer

Blend door not working.


The bleed door controls air temp not where it comes out, dash, floor, defroster, this is most likely a mode control switch problem, that switch is on the ac control head.

Sep 23, 2008 | 2001 Dodge Ram 3500 Truck

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