Question about 1998 Cadillac DeVille

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Air condition not blow though vents blowing though defrost

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The blend door may be disconnected from vacuum.

Posted on Sep 20, 2010

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Posted on Jan 02, 2017

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2 Answers

1998 Dodge Stratus - Air conditioning is blowing through the defrost vents


Vacuum controls this circuit and leaks will cause blend air door to default to defrost. Check for bad check valve or hose leaks under hood first as these are the easy ones to get at and under hood heat causes deterioration.

Jul 08, 2015 | 1998 Dodge Stratus

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Defrost isn't blowing air


ur r going to have to check the button or the release lever that alouds u to move the air to the other positions sometimes that's the problem

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Air Con on my 2009 Mercury grand marquis is giving me problems. Cold air blows out the defrost vents but will not blow out the main vents. Please advise


the blend door in the lwr air vents is stuck it should be down by the squerrl cage also it could be electronically controlled

Jul 14, 2012 | Cars & Trucks

1 Answer

Blowes air throught defrost vents only


its a problem with the switching mechanism. you have to look up under the dash to see if you can see where the switching mechanism is. if you can not see it from there youll have to remove complete center dash

Apr 04, 2010 | 2004 Jeep Grand Cherokee

1 Answer

When I turn my vent selector to defrost on the far right (air con off)the air conditioning comes on. The dash vents will blow ambient air, but defrost setting blows air con. Any ideas?


It's normal for the A/C compressor to come on with the defroster to dehumidify the air so the windsheild won't fog up under humid conditions. You can still control the air temp. out the vents with the temp. select switch.

Jul 19, 2009 | 2005 Jeep Wrangler

2 Answers

Air conditioning blows through defrost vents only


AC blows where you have your control switch set,if it only comes out your defroster have the vacuum check at the blend air doors or if you have a faulty heater control unit.

Jul 13, 2009 | 2004 Ford F150

1 Answer

Heat wont blow through heater or defroster vents


common problem, check under dash by the gas pedal if control arms are muving went selecting from ac to heat cuz this it is the control for the vents to go from ac to heat and to defrost.

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1 Answer

Air conditioning


I think it is going to be a vaccum leak.

Sep 14, 2008 | 2002 Ford F150 Regular Cab

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Air will not blow out of panel vents


vents are blocked so air is diverted to other vents, check and clean if necessary

Aug 02, 2008 | 1994 Buick LeSabre

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