Question about 2003 Ford Expedition

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Ac only blows through the defroster and floor

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  • Expert
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UNDER THE HOOD RIGHT SIDE BE THE FIRE WALL FIND THE VACUUM LINE GOING INTO THE CAB THEN TRACE THEN ON THAT LINE LOOK FOR A CHECK VALVE (ROUND PLASTIC CONNECTS TWO OR MORE LINES TOGETHER) WHEN YOU LOCATE THAT TAKE IT OFF AND BLOW IN BOTH SIDES IF YOU CAN BLOW THREW BOTH SIDES REPLACE AND CHECK OUT WITH ENGINE RUNNIG. ALSO CHECK FOR VACUUM LEAKS BY SPRAYING CARB CLEANER ON ALL VACUUM LINES AND INTAKE MANIFOLDS.

Posted on Oct 01, 2009

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  • Ford Master
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Look under the hood for a vacuum line off. The vents are controlled by vacuum that if the hose breaks or comes off default the vents to defrost so that you always have air to clear the windshield.

Listen while it is running and see if you hear a hissing sound.

If you vacuum is good, you may have a problem with the control head or the diverter valve, both are tough to replace, and since 4/5 times it is the vacuum go there first.

Hope this helps

Posted on Oct 01, 2009

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Posted on Jan 02, 2017

philriden
  • 146 Answers

SOURCE: 1998 Mustang - AC blows only through Defrost vents

You probably have a vacuum leak on the passenger side. its a small plastic hose some times they come unpluged from the engine. or brake.

Posted on Jan 05, 2009

jmgldsmth
  • 1889 Answers

SOURCE: 1999 f350 ac blows from defrost vents instead of ac vents

check for a vacuum line that has fallen off the diaphram vacuum "switch can" near the vent shift lever at the heater box under the dash passenger side

Posted on May 28, 2009

  • 2 Answers

SOURCE: 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.

Posted on Feb 04, 2010

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These will help.

Thanks.

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1 Answer

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