Question about 1999 Lincoln Continental

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Air will not come out of vents

Air will only come out of defroster and floor in my 1999 continental

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The problem is causes by a broken vacuum line. These lines are all over the engine compartment, but those affecting the A/C are between the engine and the firewall behinf a vanity plastic over.

Posted on May 13, 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

1 Answer

F250 no air from dash vents, works on floor and defrost


Possibly some blockage? Foam where it shouldnt be?

Nov 07, 2013 | Cars & Trucks

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

Air not blowing out of vent on 1999 chevy suburban


MODE SELECTION IS VACUUM OPERATED. DEFROST AND FLOOR ARE A DEFAULT MODE WHEN SYSTEM FAILS. YOU HAVE A VACUUM LEAK, FAULTY VACUUM SWITCH ON DASH CONTROL UNIT OR A BAD VACUUM MOTOR IN DASH

Jul 21, 2012 | 1999 Chevrolet Suburban

1 Answer

What is a blender/ it is suposed to a part of the heater area


The "blender" would refer to the blend actuators that change the flow of air from floor to vent to defrost or combinations. Properly working blend doors will allow you to direct air to the dash vents, the floor, the defroster, the floor and defroster or the floor and dash vents. If it is not working the heater will still work but you will hae no control oer where the air flows.

Dec 19, 2009 | 1999 Jeep Grand Cherokee

1 Answer

Air blows out thru the vents but just no hot air, aslo i have to hit the dash for the air to come out thru the dash vents at times.


sounds like bad acuator motor, this is what moves the door in heater box to set hot or cold air, and other motors to set air to blow thru defrost, vent or floor. good luck.

Oct 10, 2009 | 1999 Chevrolet Silverado 1500

1 Answer

Air vents and defroster


replace the vacuum mode control switch in the heater control, this is a dealer only part.

Mar 22, 2009 | 1999 Ford Expedition

1 Answer

1996 GMC Suburban heater blows on floor


yes those controls are vacuum controlle. Could be as simple as a bad hose or connection.

Feb 18, 2009 | 1999 Chevrolet Suburban

1 Answer

Climate Control Air Conditioning


check for vac leaks under hood and dashbord

Jun 30, 2008 | 1999 Buick LeSabre

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