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1994 cadillac sudan deville heat will only come out of passenger side

Had no heat, changed thermostat, now there is heat out the passeger side but cold air comes out the driver side. Also no air out of dash board, only air out of defrost and floor.

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Posted on Jan 02, 2017

  • 8273 Answers

SOURCE: I have some warm air on the passenger side but

This problem is usually caused by a failure of the driver's blend door actuator. This part can be replaced by the average do-it-yourselfer. Below I have pasted simple instructions from They indicate you have to first remove a panel under the dash to gain access to the heater box. Once you can see under the dash, the heater box and actuator should be visible. I recommend you leave the actuator plugged in after taking it loose just to see if it is really dead. Turn the key on and turn the driver temp up to see if the actuator spindle turns. If it turns, the door itself may be jammed--try to turn the door axle by hand. If the door is jammed, this is a much bigger job that you may not want to get into. Please let me know if you have more questions.

Driver's Side

  1. Remove the left side sound insulator.
  2. Remove the driver air mix actuator retaining screws.
  3. Remove the electrical connector from the driver air mix actuator.
  4. Remove the driver air mix actuator.


Fig. Driver side air mix actuator.

To install:

  1. Install the driver air mix actuator.
  2. Install the driver air mix retaining screws and tighten to 12 inch lbs. (1.2 Nm).
  3. Install the electrical connector to the driver air mix actuator.
  4. Install the left side sound insulator.

Posted on Dec 08, 2010

  • 4 Answers

SOURCE: 1999 cadillac Deville cold air blowing out passenger side vents

Sounds like a Blend door issue, but could be the controller switch, Test ALL modes of operation to see what works and what does not. That should narrow it down a bit. The Blend doors are flap/ doors that regulate air flow, newer vehicles are plastic - electric assemblies ...prone to failure. Any clicking or thumping noises during switching modes and on-off suggest a bad Blend door. Hope that helps...good luck

Posted on Jan 12, 2009

  • 1 Answer

SOURCE: air cond warm coming out of driver side dash,warm passenger side

you want me to post a free solution yet want to charge for info I requested for free?

Posted on Jun 19, 2009

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