Question about 2004 Cadillac Deville

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2004 Cadillac DeVille hot air blows out of passenger and rear vents when air condition is running

Hot Air blow out passengers vent when air conditioning is running. Cold air blows on drivers side.

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  • Cadillac Master
  • 12,507 Answers

Do you hear a clicking sound behind the dash ? These systems have electronic actuators that change the position of the mode doors , controlling where the air comes out of an the temp. !
This HVAC system can set DTC'S - diagnostic trouble codes
Air Temperature Actuators The air temperature actuator is a 2-wire bi-directional electric motor. Two control circuits enable the actuator to operate. The control circuits use either a 0 or 12 volt value to co-ordinate the actuator movement. When the actuator is at rest, both control circuits have a value of 12 volts. In order to move the actuator, the HVAC control module grounds the appropriate control circuit for the commanded direction. The HVAC control module reverses the polarity of the control circuits to move the actuator in the opposite direction.
The HVAC control module determines the door position by counting motor pulses on one of the control circuits. These pulses are small voltage fluctuations that occur when the brush is shorted across two commutator contacts as the motor rotates. As the actuator shaft rotates, the HVAC control module monitors the voltage drop across an internal resistance to detect the pulses. The HVAC control module converts the pulses to counts with a range of 0-255 counts. The HVAC control module uses a range of 0-255 counts to index the actuator position.
An to test this system you need a up scale professional scan tool !

Posted on Mar 30, 2015

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  • Expert
  • 127 Answers

Most likely its yours dampers that needs to be fixed. The many dampers that make up the wenting system on a car's air outlet channels can fail over time from wear or from it being handled by untrained persons. The dampers konfiguration are quite hard to fix and i wouldn't recommend it as a DIY project and therefore needs to be looked at by a professional.

Posted on Mar 30, 2015

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Does it blow out cold on the drivers side? there are controls inside the dash that sometimes get stuck, and the doors don't switch over, sometimes working with the temperature controls back and forth from hot to cold usually fix the problem.

Posted on Mar 30, 2015

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  • Cadillac Master
  • 693 Answers

Does adjusting the passenger side temperature control on the dash have any effect?

Posted on Mar 29, 2015

6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

ASEtech
  • 67 Answers

SOURCE: Hot and Cold

The most likely cause of your problem is the blend doors under your dash. If they are not moving like they should it can cause this type of problem. You can look under the dash to see if there are any linkages that are disconnected. Some of these are very hard to change so you might want to take it to a repair shop unless you are very good with cars.

Posted on Dec 03, 2008

carfreak1217
  • 109 Answers

SOURCE: ac vents

One of the temperature actuators are not working it has 2, one for each side.

Posted on Jun 28, 2009

drguilford
  • 3 Answers

SOURCE: 1997 cadillac deville a/c problems

Could be a vacuum line but have had this problem myself. The problem is most likely the "blend" air door behind the dash. This door operates via vacuum to slightly open or close allowing heated air from the heater core to mix with a/c air in the case of the passenger operating the individula comfort control button on the passenger arm rest. When the passenger wants their side a little warmer than the driver the door opens and warm air mixes in. The fix is not good. Several thousand dollars for dealer fix. The dash must be removed(and probably drivers door). My fix was to put a shut off valve on the heater hose going into the heater core so that I can shut off coolant to the core in summer temperatures. In winter I turn it back on for heater operation. Hope it helps.

Posted on Aug 07, 2009

dj_relly999
  • 4070 Answers

SOURCE: Air blows cold drivers side defrost and hot on

Hi and welcome to FixYa!

This problem is not fatale. The hose line from the blower motor to the vents is surely the problem. Please check the hoses underneath the dash for it surely is not secured. Once the hoses are in place, the air blown will be even.

Hope this helps and thank you for using FixYa! Happy New Year!

Posted on Jan 01, 2011

bendarden
  • 984 Answers

SOURCE: the two vents on driver side of car blows hot air when air conditioning is on

I believe that your Seville has dual climate controls.So it sounds like a "Blend Door Actuator" problem. It's stuck and so it's not adjusting the mix of warm or cold air; that's how temperatures are controlled in your A/C heat system. Fault code(s) stored in the HVAC control module should be available to assist with diagnoses. AutoZone will perform a free diagnostic scan.

Posted on Jun 10, 2012

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