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Discussion Starter #1
I just got done replacing the heater core in an 05 Deville. Put the dash back together making sure everything was assembled and plugged in. Filled system with coolant, fired it up let the engine get to normal operating temperature, turned the heat on. To my surprise, I was getting all the hot air I could handle from the passenger side, but, only cold from the driver side. Being that the core is brand new, I suspected that I may have left an actuator unplugged. Checked all my wires, everything seems to be in order. I do have a snapon solus pro scanner, have not retrieved codes yet. My question is, is it common for the driver's blend door actuator to go bad?
 

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Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
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18,921 Posts
use the on-board scanner to check for DTC's - Diagnostic Trouble Codes -
if you don't know how - go here -

post any codes you have -
ALONG WITH THEIR DEFINITIONS -

include whether they are C-Current or H-History -

for code definitions - go here -


here is a how-to video -
 

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Administrator
2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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67,262 Posts
I changed your thread title to be a bit more descriptive of your problem - there are a LOT of "2005 Deville" in here.

You should learn how to pull, manage, and clear diagnostic codes from the car's built-in system.

Welcome Aboard !!!
 

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2004 Deville base
'05 SRX N*/AWD, Vetts/Birds/Trucks
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395 Posts
"My question is, is it common for the driver's blend door actuator to go bad?"
I'm thinking its in the top 10 after being here a short while.
 

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Discussion Starter #5
Here's a list of the current codes retrieved from the onboard diag system...
B0409- air mix door #1 range error
B0423- air mix door #2 inoperative error
B0429- temperature control #3 rear circuit range/performance

Any info would be greatly appreciated. Thank you in advance
 

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It’s common for the temperature mix as well as the air diverter solenoids to go bad. Maybe you one or more of them unplugged?
 
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