Question about 1994 Cadillac DeVille
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
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 autozone.com. 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. Fig. Driver side air mix actuator.
Fig. Driver side air mix actuator.
Posted on Dec 08, 2010
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
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