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Old 05-07-2010, 02:53 PM   #1
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Air condition stuck in defrost?

Anyone have their ac stuck in defrost mode where it blows air to window even when switch is in max ac
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Old 05-07-2010, 03:40 PM   #2
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Re: Air condition stuck in defrost?

yes. I guess it's vacuum operated??? Mine stuck but when I turned it to vent it switched finally. This all happened after Ford repaired the bed plate gasket. Hope I don't have a problem. Seemed like it struggles when the engine is at idle but works fine while driving at highway speeds. I've heard its a costly repair. But what isn't on these things. Please post back if you find the trouble.
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Old 05-07-2010, 04:43 PM   #3
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Re: Air condition stuck in defrost?

I'm thinking it is a sign of a vacuum leak. Look for a loose hose under the hood. Or, if you have an extended warranty that covers everything, let the dealer look.

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Old 05-07-2010, 05:57 PM   #4
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Re: Air condition stuck in defrost?

I believe I read somewhere that when your vent system fails it's supposed to default to defrost since that's the best position for it to be stuck in safety wise.
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Old 05-07-2010, 08:25 PM   #5
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Re: Air condition stuck in defrost?

Quote:
Originally Posted by Ford_6L_E350
I'm thinking it is a sign of a vacuum leak. Look for a loose hose under the hood. Or, if you have an extended warranty that covers everything, let the dealer look.
Or if it has been off for an extended time, or worked on (where they might have disco'd the vacuum, then run it for awhile and see if it depressurizes back to vacuum.
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Old 05-08-2010, 07:56 AM   #6
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Re: Air condition stuck in defrost?

It indeed is a vacuum switch, see attachment hope it helps, you will just need to track the hose back.

hope it helps

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Old 05-10-2010, 09:38 PM   #7
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Re: Air condition stuck in defrost?

thanks. I'll take a look again with that diagram. It didn't start back up again. I'll have to figure out which are the vacuum lines.

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Old 05-10-2010, 11:52 PM   #8
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Re: Air condition stuck in defrost?

There is an access cover in the center of the top of the dash. There are several vacuum lines under this cover. There is also a vacuum connection behind the AC/heater selector switch at the dash, and other vacuum connections up under the passenger side of the dash/foot area.

There is also a vacuum line that routes to the rear driver corner that also is accessible behind the lower plastic trim on the driver door pillar, aft of the seat belt. These vacuum lines were pre-plumbed by Ford for future rear AC.

If there has been any work done in any of these areas, I'd start there.

I hope this helps!

John K.
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Old 05-13-2010, 09:44 PM   #9
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Re: Air condition stuck in defrost?

That definitely does help... i'll check it out this weekend. If there is one underneath the passenger foot area, that might be the one I'm looking for!

Joe
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Old 05-19-2010, 10:50 AM   #10
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Re: Air condition stuck in defrost?

I may be too late on this reply. I recently had the same problem. I purchased and installed a new selector switch, didn't help. I searched all vacuum lines and finally found where a mouse had chewed through the line above the passengers feet under the hood. The system does default to defrost with a vacuum loss. Good luck.
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