Question about 1997 Cadillac DeVille

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Air conditioning blows out defrost but won't blow out vents.

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Posted on May 01, 2010

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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.

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

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Air Condition blows out the defrost.


You have a vacuum under the hood that is broken,sucked together,or disconnected,it will be going into the firewall.

Jul 26, 2010 | 1997 Jeep Grand Cherokee

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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

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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.

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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.

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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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I think it is going to be a vaccum leak.

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check for vac leaks under hood and dashbord

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