Question about 1999 Lincoln Continental

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Got a yellow vacuum hose hanging from the climate control. Air conditioner only blows through the defroster. I think this hose controls the door to route the air to the vents.

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Get under dash look for hoses you'll probably see this one off a port

Posted on Nov 11, 2012

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There are air pods on the heating and cooling system that opens different vents. Look under either the drivers or passenger side dash and feel around. It will be kinda hard to find just take your time and a flash light so you can see what your looking for.

Posted on May 13, 2009

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1 Answer

A/C climate control in car will constantly blow on the windshield instead of at occupants.


It will not be the ac as it is cooling
It will be a problem climate control module and vent control system.
might be a vacuum hose that was disturbed during the hose replacement.

Mar 08, 2015 | Cars & Trucks

1 Answer

Why did the passenger side of the dual climate control on my Buick Lucerne only start blowing cold air? Have no heat on that side, just air conditioning works.


May b a blend door issue..
If its electronic unit then maybe a actuator gone bad
If controlled by vacuum then a broken/loose hose
Does that side change from different settings(dash/floor/defrost even)= blend door issue usually

Sep 17, 2014 | 2007 Buick Lucerne

1 Answer

Fan speed control works on high only


I am experiencing the same problem. I've had two different diagnoses:

1) Blower Motor Control Module/Resistor (under $40)
Dorman Part # 973442
2) AC and Heater Control Switch (Reman. Part: $234 + Core charge of $222.)
DORMAN Part # 599030
(Prices current from RockAuto.com.)

In addition to the recent blower problem, 5 years ago I had the A/C blowing out the floor/defrost vents only, too; but with no vacuum leaks. I was told then I needed the AC/Heater Control Switch; but instead I made it a "manual" automatic climate control. I disconnecting the vacuum connector plug from the control unit and used the male end to make the connections. It was much easier on my pocket book and still works today.

The connections I found on my 2003 Grand Marquis:
Black: Supply
Blue: Panel door
White: Air inlet door
Yellow: Floor/Defrost door
Red: Floor door

The Fix:
I used a vacuum hose directly from Black to Blue and White. This required a short piece of vacuum hose with one T connection. The temp control still works including the fan speed control (until now). I live in Texas and it doesn't get too cold. But occasionally I connected Black to Yellow directly to get me thru those real bad cold spells.
Bottom Line: Not sure what I going to do but leaning towards replacing the Control Switch and the vacuum connector plug. Especially, since the price of the switch is more reasonable today. A 50% savings from 5 years ago.

Jul 05, 2014 | 2003 Mercury Grand Marquis

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

Only cold air is available, what can I do to fix the blend door temporarily


I would repair the problem if I have to disassemble the varioius parts to get at the air doors --- In-Vehicle Temperature Sensor Removal & Installation To Remove:
In-vehicle temperature sensor ford-10-00-433.gif

  1. Remove the climate control head.
  2. While pressing the retaining tabs inward, remove the in-car temperature sensor.
To Install:
  1. While pressing the retaining tabs inward, install the in-car temperature sensor.
  2. Install the climate control head.
---
Air Door Actuators/Motors Removal & Installation Air Inlet Door (Recirculation) Vacuum Motor To Remove:
  1. Remove the instrument panel.
  2. Remove the air inlet door motor mounting screws. CAUTION
    Do not attempt to bend any part of the air inlet duct door lever.
  3. Rotate and remove the air inlet door vacuum control motor.
To Install:
  1. Rotate and install the air inlet door vacuum control motor.
  2. Install and tighten the mounting screws.
  3. Install the instrument panel.
Defroster Door Vacuum Motor To Remove:
  1. Remove the passenger air bag module from the instrument panel.
  2. Disconnect the vacuum line and remove the mounting screws. CAUTION
    Do not attempt to bend any part of the defroster airflow mode door lever.
  3. Rotate and remove the vacuum control motor from the defrost door lever.
To Install:
  1. Rotate and install the vacuum control motor on the defrost door lever.
  2. Install and tighten the mounting screws.
  3. Connect the vacuum line to the vacuum control motor.
  4. Install the passenger's air bag module.
Floor Console Register Duct Vacuum Motor To Remove:
  1. Remove the floor console.
  2. Remove the right-side instrument panel insulator.
  3. Working from the passenger's footwell, disconnect the vacuum hose.
  4. Remove the screws and the floor console register duct vacuum control motor. CAUTION
    Do not attempt to bend any part of the floor console register duct door lever.
  5. Rotate and remove the vacuum control motor from the floor console register duct door.
To Install:
  1. Rotate and install the vacuum control motor onto the floor console register duct door.
  2. Install and tighten the mounting screws.
  3. Connect the vacuum hose to the floor console register duct vacuum control motor.
  4. Install the insulator under the dash.
  5. Install the floor console.
Panel/Floor (Heater Air Damper) Door Vacuum Motor To Remove:
Panel/floor door vacuum control motor shield ford-10-00-403.gif

  1. Working through the driver footwell, remove the two screws and the shield. CAUTION
    Do not attempt to bend any part of the airflow mode door lever.
  2. Label and disconnect the two vacuum hoses.
  3. Remove the vacuum control motor mounting screws.
  4. Lift, rotate and remove the panel/floor (heater air damper) door vacuum control motor from the door lever.
To Install:
  1. Install the panel/floor (heater air damper) door vacuum control motor on the door lever.
  2. Install and tighten the mounting screws.
  3. Connect the vacuum hoses in their original positions.
  4. Install the shield on the vacuum motor.
Temperature Blend Door Actuator To Remove:
  1. Remove the integrated control panel.
  2. Remove the right-side lower instrument panel insulator.
  3. Lower the glove compartment.
  4. If equipped with Electronic Automatic Temperature Control (EATC), remove the 2 remote climate control module screws and position the module aside.
  5. Remove the temperature blend door linkage shield.
  6. Disconnect the temperature blend door electrical connector.
  7. Remove the temperature blend door actuator mounting screws.
  8. Remove the temperature blend door actuator.
To Install:
  1. Position the temperature blend door actuator on the plenum.
  2. Install the temperature blend door actuator mounting screws.
  3. Connect the temperature blend door electrical connector.
  4. Install the temperature blend door linkage shield.
  5. If equipped with Electronic Automatic Temperature Control (EATC), reposition the remote climate control module and install the 2 mounting screws.
  6. Raise the glove compartment.
  7. Install the right-side lower instrument panel insulator.
  8. Install the integrated control panel.
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Nov 05, 2010 | 2000 Ford Taurus

2 Answers

Air conditioner will only blow air out the defroster vents.


Defrost is the default when the controller is not receiving vacuum from the intake manifold. Look for the small vacuum line going from the engine intake manifold to the firewall and trace it to the control switch. If the vacuum line looks OK, try to pull the vacuum connection from the control switch. Then start the car and see if there is vacuum coming to the connector from the line that you traced from the engine. If no vacuum, the line has a leak--retrace to the manifold. If there is vacuum, your switch is probably leaking. You can buy a new vacuum switch from Ford or some parts stores. More questions, please let me know.

Sep 09, 2010 | 2004 Ford Crown Victoria

1 Answer

Air Conditioner on my 98 DeVille has been a little flacky for a long time. Sometimes would stop blowing throught A/C vents and instead blow through heater and defrost. After a few minutes it's alway gotten...


The paths through your climate system are controlled by blend & diversion doors that are controlled by your settings and actuated by vacuum 'motors.' If you live in a hot climate, you may have cracked vacuum hoses which can cause the kind of random air temp and mix you are having.
If you have never had any maintenance done that involves rubber products, it may be time to do it.

Jun 19, 2010 | 1998 Cadillac DeVille

1 Answer

Climate control is on defrost only the auto


Check your vacuum pump located on the right side fenderwell. see if its running. Check the vacuum hose at the hubs for leaks or damage. repair if damaged. check for other vacuum leaks such as the grey hose going to the heater control valve.

Oct 03, 2009 | 2003 Ford F250 Super Duty Crew Cab

1 Answer

Air conditioner in my 1999 Ford f-150 only blows out the defrost


Look around under the hood for a broken or dislodged vacuum hose. The door that directs the air flow is controlled by vacuum and after 10 years those hoses get brittle.

Sep 29, 2009 | 1999 Ford F150 Regular Cab

4 Answers

Climate controls


Car manufacturers use the defrost mode as a default for safety reasons. Being they want you to be able to defrost the windshield no matter what. So when something goes wrong the system automatically goes to the defrost mode. You most likely don't have the vacuum hose connected under the dash at the climate control assy. Or if this vehicle doesn't use the vacuum hose style you may have not plugged in one of the connectors under the dash or behind the climate control assy. Good luck.

May 21, 2009 | 1997 Lincoln Continental

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