Question about 1996 Lincoln Town Car

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Automatic climate control only stays on defroster will not go to vents

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You may have sourt of problem with your control assemly or probably your duct system has been disturbed.

Posted on Nov 15, 2009

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does the car have automatic climate control?

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It all depends on whether your truck is equipped with Automatic Climate Control or Manual HVAC. You could have a broken control head assembly a broken mode door cable, a failed electronic mode door actuator, a broken mode door, or a loose or broken wire or connector.

To put it simply, your mode doors are not swithching modes - the reason for this can vary depending on which system you have.

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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
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May 21, 2017 | 2003 Mercury Grand Marquis

1 Answer

My 04 crown vic will not change off from defrost, indicator lights show floor and vent when pushed but air flow stays on defrost, it does have automatic climate control if that makes any difference


Check for vacum at the heater control ports behind the dash and for vacum leaks. For safty reasons the
system is designed to go to defrost mode in case you lose vacum to the system. Hope this helps.

Mar 14, 2010 | 2004 Ford Crown Victoria

1 Answer

Climate controls wont change from vents to defrost


There may be a problem in the climate control head. The most common problem with HVAC systems of that error is a broken vacuum line. Usually the feed line to the control panel is broken or disconnected from the engine and it is stuck in defrost mode as it's the default mode. If your stuck in the vent mode there may be a broken line at the climate control panel, a broken line to an actuator or a bad actuator.

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1 Answer

My ac stays on defrost or floor until i drive for


The climate control module has a vacuum leak inside. It can be repaired but it is unlikely that you will find someone to tear it appart and do it. You will most likely have to replace the module.

Nov 14, 2009 | 2004 Ford Crown Victoria

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92 park ave climate control


There is a climate control module behind dash on passenger side probably going to be the problem

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Does your vehicle have manual or automatic climate control ? The blower motor control processor may be the problem .
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1 Answer

Loss of climate vent control


You are losing vacuum source to the system.
There should be some kind of vacuum reservoir under the hood.

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