Question about 2003 Buick Regal

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My vent, heater, defrost would not come on.

None of the components within that system would work.

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  • Darkengo Feb 15, 2009

    I replaced blower motor however still get a little power runs for 10 seconds and atops , like old motor

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Started working that afternoon on its own

Posted on Jan 13, 2009

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Posted on Jan 02, 2017

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1 Answer

Nothing coming from the vents when you turn on the a/c, heater, or defroster


You can jumper the fan motor to make sure it runs and if it does then look at the switch or resistor. You can also remove the resistor and omh acrossed it to make sure that it hasn't blown the fuse on risistor.

Feb 11, 2014 | 2003 Chevrolet Silverado 2500HD

1 Answer

Heater works in cab blower works in cabnin just not blowing heat


hot air not being directed to vents? Check vaccuume hose under hood

Jan 29, 2014 | 2002 Ford E350

1 Answer

Air conditioning will not switch from defrost vents


Vacuum control motors are used to position these airflow control doors.
SECTION 412-01: Air Distribution and Filtering 2000 Expedition/Navigator Workshop Manual DESCRIPTION AND OPERATION Procedure revision date: 06/17/1999 Air Distribution There are two sources of air available to the air distribution system:
  • outside air
  • recirculated air
Recirculated air is only used during MAX A/C, AUTOMATIC (if equipped with EATC) and OFF modes.
Air distribution within the vehicle is determined by the function selector switch position, if equipped with manual A/C, or is controlled by the electronic automatic temperature control system in the AUTOMATIC mode but can be overridden by the driver if desired. Airflow control doors are used to direct airflow within the heater air plenum chamber. Vacuum control motors are used to position these airflow control doors.
The air distribution system is designed to provide airflow from the defrost nozzle when no vacuum is applied to any of the vacuum control motors. This is done to prevent a situation where defrost cannot be obtained due to a system vacuum leak.
Air enters the passenger compartment from the:
  • instrument panel A/C registers.
  • heater outlet floor duct.
  • windshield defroster hose nozzle.
  • side window demisters.
  • rear seat airflow duct (if equipped).
Passenger compartment air is exhausted from the vehicle through open windows or cab air vents.


expedition air flow hvac system-xvcmtr1jbqa4kfrdszeh0lpe-3-0.gif Item Part Number Description 1 18A318 Vacuum control motor - panel/defrost door 2 18A478 Panel/defrost door (full vacuum position) 3 - Defrost airflow 4 - Side window demister airflow 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 19805 Blower motor 12 - Vacuum to emission control 13 - Vacuum from the engine intake manifold 14 19A563 A/C vacuum check valve 15 19A566 A/C vacuum reservoir tank and bracket 16 19B888 A/C-heater function selector switch 17 18476 Heater core 18 18A559 Floor/panel door (full vacuum position) 19 - Floor airflow 20 18A318 Vacuum control motor - floor/panel door 21 - Panel vent airflow
Check vacuum control to the panel defrost motor ( vac,diaphragm )

Nov 01, 2017 | 2001 Ford Expedition

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

When I cut on my air or my heat it will not blow out the vent but it will blow out the defroster what is the problem 1995 Catilac sedan Seville


One of you motors in the heater venting system has burnt a fuse, burnt out or has come disconnected. This prevents a flap in the heater from changing positions and sending air to the floor or the defrost.
Have you had a heater core or motor replaced recently as the heater ducting needs to be removed for some of this work and it is possible to have problems with the heater venting doors not moving after the work is done.

Mar 20, 2011 | 1995 Cadillac DeVille

1 Answer

Blender door not working correctly on 2003 grand Marquis. Bows out defrost but not vents. Occasionly out the vents but not often


not blend door, blend door is responsible for mixing hot air from heater core side with cold air from evaporator side of the system. you have a problem with your panel doors it may be an electrical problem with signals from you heater control module or a vacuum problem or you may have damaged components inside your dash. your vehicle will default to defrost setting automatically if there is a problem in the system

Apr 07, 2010 | 2003 Mercury Grand Marquis

1 Answer

Front defogger blows out heater vent when set on DEF. All of the heater, a/c, settings work properly. One day, I turned on the DEF and the warm air blows out of the heater vents, not the defroster area. I...


Sounds like the flap valve in your vent system that allows air to go to the defrosters is either jammed or broken. Unfortunately you will have to take the vent system apart to look.

Nov 05, 2009 | 1989 Oldsmobile Cutlass Ciera

1 Answer

My 1998 Subaru Legacy defrost is stuck on defrost. None of the other control buttons (vents, floor, floor + defrost) work. This is an intermittent problem.


probably whatever you put in the cupholder has spilled on the controls causing them to stick,poor design isn't it? no real fix ,i would try to spray some silicone in between the buttons and try to free them,look into buying a unit from the junk yard, not a hard component to change at all

Sep 03, 2009 | Subaru Legacy Cars & Trucks

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