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Discussion Starter #1
Yesterday we finally got some nice weather, and I turned the AC on, but it won't blow out the vents, it will only blow out of the defrost, what's up with that? :yikes:

I have to turn my windshield wipers on because the glass gets cold enough that I get condensation on the outside of the windshield. :mad2:
 

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You have a vacuum leak or the blend door actuator is shot....depending on the vehicle it may be both.
Year Make Model will be helpful

When there is a loss of vacuum the blend door will default to the defrost setting for safety reasons...the windshield needs to stay clear.
 

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Discussion Starter #3
Thanks Cuda_jim
Its my '98 windstar 3.8L

I don't think it is the blend door, because I can change the temperature, but I agree that it could be whatever the door is called that controls the direction of air flow.
I found this diagram
 

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Doooh! I meant Air Flow Control Module.....not Blend Door, sorry.
The vacuum leak still applies though.
 

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since the topic came up....

My crown vic blows AC through the vents.... however, FLOOR, DEFROST, and DEF/FlOOR dont work...

any thoughts for that?

could be the blend door actuator? I turn on the defrost or floor... and the air still blows through the VENT.

its an EATC by the way.
 

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Discussion Starter #7
Cuda_Jim ... You da man! :)

THANKS!!!
 

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since the topic came up....

My crown vic blows AC through the vents.... however, FLOOR, DEFROST, and DEF/FlOOR dont work...

any thoughts for that?

could be the blend door actuator? I turn on the defrost or floor... and the air still blows through the VENT.

its an EATC by the way.
Not the Blend door. :nono: The blend door is positioned by an electric actuator.
Your Crown Vic is essentially the same as the Windstar. If the air ONLY comes out the dash vents, then diaphrapham #9 needs to be investigated. The internal spring may have broken. The door may also be jammed.
 

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Have you changed your plugs and wires recently? I ask because on my ranger there are some small plastic vacuum lines that run from the manifold down around the plug wires and into a plastic ball. I broke one of these when I was replacing my plugs and it caused the air to only blow out of my defrost.
 

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Discussion Starter #13
Thanks Guys, the temperature got a bit cooler, and I don't drive the van that often, so the air to defrost wasn't a big issue yet, however, it started surging at idle so I figured I would look for that vacuum leak.

It was a real easy find.
The elbow right on top of the intake manifold by the IAC was leaking.

Replaced it, no more surging idle, and the ductwork works properly again.
 

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Discussion Starter #16
Sure smells like spam to me.

LOL... I happen to know the author of that Howto locate a vacuum leak VERY well! :) He's a really nice guy, and has some great friends! ;)
 
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