Question about 1994 Cadillac DeVille

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AC cold air out of my defrost vents

My ac air is blowing cold air out of the defrost instead of the dashboard vents, I was told that a module under the dashboard went out ant it would cost around $750.00 for this part and a additional $300.00 in labor, is it possible that I could have a vacuum leak instead? It does change over to the dashboard vents every once and a while but more often through the defrost vents.

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  • fedd61 May 19, 2009

    My AC blows cold air out of the derost vents--not the dash vents. Occasionally it will switch, but not often. I also notice some peculiar sounds (whirring, rubbing, like plastic on plastic) when I turn the system from "Off" to "Auto."

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  • Cadillac Master
  • 75,797 Answers

U need to check the vacuum from the engine to the ac control head, the air defaults to the defrost when the system looses vacuum from the engine, this is for safety.

Posted on May 12, 2009

  • Rick Vandeveer
    Rick Vandeveer Jun 16, 2016

    can i do this? what is the location?

  • yadayada
    yadayada Jun 16, 2016

    I have no clue about your skill level so whether you can do this is hard to say. Also you need a well stocked tool box.

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2 Answers

Vents won't blow hot or cold air. Comes from defrost and feet when you put fan on.


It's the vent actuator, it moves the baffle that changes the direction of the air flow.
Here is a video of a broken vacuum hose that creates the same problem.

It could also be a failed actuator.

Sep 19, 2016 | 1997 GMC Safari

2 Answers

My ac air is


Without doing so testing it would be hard to say , would just be guessing . Where did you have it checked ? If it does change every once and a while , I would think it could be a sticking actuator or in the heater and A/C programmer module . The heater and A/C programmer will direct the blended air in one of several air delivery modes. The side window outlets receive the airflow during all of the modes of the operation. The heater and A/C programmer directs air to the other outlets by energizing specific vacuum valves. This feeds the appropriate combination of mode valve actuators.
1
  1. Turn the engine ON.
  2. Select HI BLOWER.
  3. Connect the Scan Tool .
  4. Use the Scan Tool in order to command recirculation door movement.
Does the recirculation door operate?
--
Go to Step 2
Go to Step 3

2
Using the
Scan Tool , select AIR DOWN.
Is most of the air flowing from the heater (floor) vents, with only a small bleed out of either the defrost vents or the A/C vents?
--
Go to Step 7
Go to Step 4

3

  1. Remove the programmer vacuum hose connector.
  2. Measure the vacuum on the orange hose.
Is the vacuum less than the specified value?
10 in Hg
Go to Step 14
Go to Step 13

4

Attach a hand held vacuum pump to the YEL CKT.
Does the vacuum pump hold vacuum?
--
Go to Step 5
Go to Step 6

5

  1. Inspect for a stuck up/down valve or actuator.
  2. Inspect for the proper hose routing. If the routing is OK, replace the heater and A/C programmer. Refer to .
Is the repair complete?
--
Go to Step 16
--

6

Repair the leaking hose or the actuator.
Is the repair complete?
--
Go to Step 16
--

7
Using the
Scan Tool , select A/C DEFROST.
Is most of the air flowing from the the A/C vents or the defrost vents, with only a small bleed from the heater vents?
--
YES Go to Step 8
NO Go to Step 9

8

Is most of the air out of the defroster vents?
--
YES Go to Step 10
NO Go to Step 11

9

Attach the hand held vacuum pump to the RED CKT.
Does the pump hold vacuum?
--
YES Go to Step 5
NO Go to Step 6

10
Using the
Scan Tool , select AIR UP.
Is most of the air flowing from the A/C vents with only a small bleed out of the defroster vents?
--
System OK
Go to Step 12

11

  1. Inspect for a stuck A/C-defrost valve (door) or actuator.
  2. Inspect for proper hose routing. If the hose routing is OK, replace the heater and A/C programmer. Refer to .
Is the repair complete?
--
Go to Step 16
--

12
  1. Repair the leaking hose or actuator.
  2. Inspect for a stuck A/C-defrost valve (door) or actuator.
  3. Inspect for proper hose routing.
Is the repair complete?
--
Go to Step 16
--

13

Attach the hand held vacuum pump to the ORN CKT.
Does the pump hold vacuum?
--
Go to Step 15
Go to Step 6

14

Repair the vacuum source.
Is the repair complete?
--
Go to Step 16
--

15

  1. Inspect for a stuck inlet valve (door) or actuator.
  2. Inspect for proper hose routing. If OK, replace the heater and A/C programmer. Refer to .
Is the repair complete?
--
Go to Step 16
--

16

  1. Clear the DTCs.
  2. Verify that the system is operating properly.
Did you clear the DTCs and verify the operation?
--
System OK

Good luck hope this helps ! Do you need directions on how to get the heater / A/C controller out .

Jun 17, 2016 | 1999 Cadillac DeVille

1 Answer

My heater does not blow in floor in a dodgeram 1500


the heater vacuum motor and lines needs to be checked.Also get the blend door checked.

NO HEAT ON FLOOR VENTS

---------

As per your problem mentioned. There are few solved help links to troubleshoot these problems. Go through the list and Click the link below:----

2000 Toyota Avalon: No heat on Passenger Side?

http://whatisbyme.blogspot.in/2012/05/2000-toyota-avalon-no-heat-on-passenger.html


------------

No heat on Oldsmobile Silhouette?


http://technoanswers.blogspot.in/2012/02/no-heat-on-oldsmobile-silhouette.html

------------

Heater blows cold?

http://schematicsdiagram.blogspot.in/2012/02/heater-blows-cold.html

-----------

Heat blows cold on drivers side and hot on passenger side?

http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html

----------

Hot air on the driver's side vents only?

http://repairhelpcenter.blogspot.com/2012/01/hot-air-on-drivers-side-vents-only.html

--------------

Temperature gauge does not move and no heat when heater is ON?

http://technoanswers.blogspot.com/2012/01/temperature-gauge-does-not-move-and-no.html

-----------

1992 Toyota Camry: A/C Control light Flashing and A/C not Blowing Cold?

http://technoanswers.blogspot.in/2012/04/1992-toyota-camry-ac-control-light.html

--------------

No heat, blower blows only cold?

http://technoanswers.blogspot.in/2012/02/no-heatblower-blows-only-cold.html

----------

Ford F150 Ac only blows through defrost vents?

http://technoanswers.blogspot.com/2012/01/forf-f150-ac-only-blows-through-defrost.html

----------

Dodge A/C come out of defrost vents only?

http://technoanswers.blogspot.com/2012/01/dodge-ac-come-out-of-defrost-vents-only.html

---------

Ac vacuum line on dodge cummins?

http://technoanswers.blogspot.com/2012/01/ac-vacuum-line-on-dodge-cummins.html

---------

Ford ranger AC blows cold through defrost vents instead on cabin vents?

http://technoanswers.blogspot.com/2012/01/ford-ranger-ac-blows-cold-through.html

----------

2005 Chrysler PT Cruiser: A/C Blows Warm?

http://whoisbyme.blogspot.in/2012/06/2005-chrysler-p8t-cruiser-ac-blows-warm.html

-------------

2009 Mercury Grand Marquis: A/C blows Cold From Defrost Vent Only?

http://whoisbyme.blogspot.in/2012/06/2009-mercury-grand-marquis-ac-blows.html

-----------

AC not blowing through Vents on 2007 Chevy Trailblazer?

http://schematicsdiagram.blogspot.in/2012/04/ac-not-blowing-through-vents-on-2007.html

----------

Passenger side temperature is warm air out of dash vents?

http://schematicsdiagram.blogspot.in/2012/04/passenger-side-temperature-is-warm-air.html

----------


These will help.

Thanks.

Nov 28, 2012 | Cars & Trucks

1 Answer

No heat from vents


As per your problem mentioned. There are few solved help links to troubleshoot these problems. Go through the list and Click the link below:----

2000 Toyota Avalon: No heat on Passenger Side?

http://whatisbyme.blogspot.in/2012/05/2000-toyota-avalon-no-heat-on-passenger.html

------------

No heat on Oldsmobile Silhouette?


http://technoanswers.blogspot.in/2012/02/no-heat-on-oldsmobile-silhouette.html

------------

Heater blows cold?

http://schematicsdiagram.blogspot.in/2012/02/heater-blows-cold.html

-----------

Heat blows cold on drivers side and hot on passenger side?

http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html

----------

Hot air on the driver's side vents only?

http://repairhelpcenter.blogspot.com/2012/01/hot-air-on-drivers-side-vents-only.html

--------------

Temperature gauge does not move and no heat when heater is ON?

http://technoanswers.blogspot.com/2012/01/temperature-gauge-does-not-move-and-no.html

-----------

1992 Toyota Camry: A/C Control light Flashing and A/C not Blowing Cold?

http://technoanswers.blogspot.in/2012/04/1992-toyota-camry-ac-control-light.html

--------------


No heat, blower blows only cold?

http://technoanswers.blogspot.in/2012/02/no-heatblower-blows-only-cold.html
----------

Ford F150 Ac only blows through defrost vents?

http://technoanswers.blogspot.com/2012/01/forf-f150-ac-only-blows-through-defrost.html

----------

Dodge A/C come out of defrost vents only?

http://technoanswers.blogspot.com/2012/01/dodge-ac-come-out-of-defrost-vents-only.html

---------

Ac vacuum line on dodge cummins?

http://technoanswers.blogspot.com/2012/01/ac-vacuum-line-on-dodge-cummins.html

---------

Ford ranger AC blows cold through defrost vents instead on cabin vents?

http://technoanswers.blogspot.com/2012/01/ford-ranger-ac-blows-cold-through.html

----------

2005 Chrysler PT Cruiser: A/C Blows Warm?

http://whoisbyme.blogspot.in/2012/06/2005-chrysler-p8t-cruiser-ac-blows-warm.html


-------------

2009 Mercury Grand Marquis: A/C blows Cold From Defrost Vent Only?

http://whoisbyme.blogspot.in/2012/06/2009-mercury-grand-marquis-ac-blows.html

-----------

AC not blowing through Vents on 2007 Chevy Trailblazer?

http://schematicsdiagram.blogspot.in/2012/04/ac-not-blowing-through-vents-on-2007.html

----------

Passenger side temperature is warm air out of dash vents?

http://schematicsdiagram.blogspot.in/2012/04/passenger-side-temperature-is-warm-air.html

----------


These will help.

Thanks.

Nov 28, 2012 | 2006 Ford Taurus

1 Answer

AC is only blowing through the defrost vents in the dashboard?


I think your problem is the head unit that selects where the air comes out ie. Face, floor, defrost, or hi-level face and floor. If that's not working then it will not let you switch location that you want the air to come out.

Jul 26, 2012 | 2003 Chevrolet Tahoe

2 Answers

2003 gmc Yukon 5.3 ..2WD air conditioner blows


A vacuum hose that controls the little door that switches where the air blows from is off, its gonna be a real chore the find which one and take the dash out to get to it, but you might get lucky and be able to look underneath the dash from the passenger side and actually see it, good luck

Jun 19, 2010 | Cars & Trucks

1 Answer

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

May 28, 2009 | 2000 Ford F350 Super Duty Super Cab

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.

Jan 18, 2009 | 1997 Chevrolet K1500

1 Answer

Dashboard AC Vents don't work


check the vent housing under dash it is vacuum controled most likley you got a line off or broken not allowing door inside to open worse case scenerio the acuator on it has gone out and needs replaced hope this helps

Aug 31, 2008 | 1995 Oldsmobile Cutlass Ciera

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