Question about 2004 Jeep Grand Cherokee

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My vent controls will not change where the air is dispersed from - it is only using the defroster. Is there a fuse that contrils this?

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Possibly but most likely stuck actuator door or switch goto dealer get print out of system and figure out where switch and door is and motor to control door then start isolating problem!!!Best of Luck to you!!!

Posted on Jun 26, 2009

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The control motor or the cable that moves the door s not working, and unless your fairly able to fix stuff it's best left to someone who know what they are doing or have a camera and get one of the guys here to work with you but it is not an easy task for the weak hearted.

Posted on Jun 26, 2009

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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:
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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.
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Air enters the passenger compartment from the:
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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

2 Answers

Air only comes out defrost in all settings


I just fixed mine. The lever that opens and closes a door that directs the air flow to the defroster was broken. To be more specific, the plastic lever the actuator attaches to was broken. The actuator and the vacuum system were operating properly. It is simple to see but hard to get to. Remove the glove box and look up and to the left for a silver vacuum controlled actuator. I was able to fabricate another lever and attach it to what was left of the OEM lever.

Sep 20, 2012 | 2005 Cadillac Escalade Ext

1 Answer

Air not blowing out front vents just defrost and heater vent


it is probally your control unit in default mode as defroster is needed for saftey. your control unit might be bad but check your fuses first.

Jun 20, 2012 | Chevrolet Blazer Cars & Trucks

1 Answer

No heat coming from vents. Only cold air. 1998 caddy seville with climate control. No air coming from front vents at all, only defroster and heater vents.


Fuse has blown in the heater control unit, I had this on my audi last year most likely cause, get youe user manual and loacte the fuse box.

Jan 13, 2010 | 1998 Cadillac Seville

2 Answers

AC & Hot air only blows out defroster


May be I can help,you have a vent door actuator motor that has gone out..Roniecon@gmail.com

Jul 19, 2009 | 2004 Jeep Grand Cherokee

4 Answers

Heating / air conditioning control stuck to front defrost vents


There is a vacuum leak under the hood. Find the vacuum line on the passenger side where it comes through the firewall and follow it to the engine. You system needs vacuum to operate and without it the default setting is on defrost for safety reasons.

Jun 19, 2009 | 1999 Dodge Durango

2 Answers

No air or heat blowing from vents


if the fan is blowing this could be a problem with the climate controll switch that changes the direction of air from floor to defrost to vents, some are vacuum controlled through a vacuum operated mechanism that opens and closes a door in the vents which redirects the air to different places.

Mar 24, 2009 | 1999 Volvo S80

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