Question about 2004 Ford Super Duty F 450

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The selector switch for dash air ,floor air doesn't direct the flow of air stays on windshield air only is there a relay or a diaphram problem?

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Hi, sounds like a vacuum problem. When you select from floor to vent to defrost, the system uses vacuum from the engine to change over. If you look under the hood, near the firewall, towards the center, there should be small rubber vacuum lines. Check these lines for leaks with the engine on by spraying soapy water on the lines. If you see bubbles forming on any of the vacuum lines, this is where the leak is. Also check the vacuum lines going to the climate control unit inside the vehicle.

Posted on Jul 27, 2009

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Posted on Jan 02, 2017

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2002 mountaineer heater works, but won't blow out of the top vents that. The bottom vents work fine.


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Air Flow Control
Air flow control is accomplished in the following manner:
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vacuum control motor-i4bq0ig33y1522pr2d2rrkk3-2-0.gif

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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
Source

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1 Answer

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The switch might be bad, but if it's vacuum operated, there is a vacuum operated diaphram
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3 Answers

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1 Answer

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