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Discussion Starter #21
I did read the left temperature actuator re-calibrates each time the ignition is turned on. I have also read to recalibrate the whole system you can remove the battery for a couple minutes, reconnect it and leave alone for a couple minutes and it recalibrate the whole system.. Will disconnecting the battery make the radio need to be reactivated with the radio protection code?
 

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Master of the Dark Art of Diagnostics
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assuming the passenger side temp control is OFF -
the most common cause for slightly warmer air on the driver side vents is low freon charge -

to verify the mix door actuators are NOT the problem - exercise the system -

manually set the MODE door to the center vents -
manually set the blower to a medium high speed -
turn the temp up to 90* -

note the air temperature blowing from each of the two middle vents - same? or different?
a thermometer would be MOST helpful here - a cooking/meat thermometer would work great -

NEXT - turn the temp down to 80* -
note the air temp from each of the two middle dash vents - same? - different?

now turn the passenger side temp control ON -
turn the passenger side temp control FULL warmer -
there should be about 5* warmer air from the passenger side vents -

now turn the passenger side temp control FULL colder -
the vent temp should be about 5* colder than the driver side vent -

assuming the above tests were OK - turn the passenger side control OFF -

turn the temp down to 60* -
note the air temp from each of the two middle dash vents - same? - different?

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the cabin temp sensor uses a tiny squirrel cage fan to draw cabin air past the thermistor -
it is possible - even probable - that lint/dust has collected in the fan -
thus reducing the airflow - resulting in inaccurate cabin temp readings -
 

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Master of the Dark Art of Diagnostics
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it is possible - though rare - that the mix door actuator is out of calibration -

the actuators are all monitored - and if "out of wack" - should set a DTC -
in fact - ALL of the actuators - temp sensors - etc - are monitored -
and should set a DTC if they are not functioning properly -

to erase the memory - recalibrate - disconnect BOTH battery cables - NEGATIVE first -
and touch them together for a few seconds -
then reconnect them - POSITIVE first -

NO - it will NOT clear the radio stations or settings -
and there is no "radio protection code" -
the radio THEFT LOC system recorded the VIN of the car the first time it was turned on -
and compares the stored VIN to the current VIN -
if they match - the radio plays - if they do NOT match - the radio gets locked - and will NOT play -
 

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Discussion Starter #24
Hi, Here we go
outside temp 92 degrees
Left = drivers side , Right = passengers side Both center vents
Start up at 70 degrees (2 minutes) Left 73.9 Right 55.8
Mode center, mid fan
Set 90 degrees left 146 right 146
Set 80 degrees left 65.4 right 55.4
set 60 degrees left 57.3 right 53.2
set 60 degrees (passenger max) left 69.3 right 65.2
set 70degrees left 55.0 right 51.3
set 70 degrees (passenger Max) left 70.1 right 56.8

I have not tried to do the battery off reset
 

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With no codes, you can rule out the sensors.

P.S.
I seem to recall a problem similar to yours on my previous Deville. Excercising the door by running the temp up to 90° and then back down to 60° a couple of times solved the problem.
 

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Discussion Starter #27
I will try the cycling of the mix door tomorrow..
It seems like the mix door is not fully opening or closing, but it is working maybe not well but somewhat working..
 

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Discussion Starter #28
I tried the cycling of the 60 degrees to 90 degrees. It cycles to the lower vents with heat
and upper vents and the A/C t comes on.. It still has a 6 to 10 degree difference.. The only thing I think it could be
is one of the three items the module, the sensor or the mix boor actuator/door..
Have not tried the system reset with the battery terminals..
 

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Master of the Dark Art of Diagnostics
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I also ran the obd2 scan and there were no codes there either..
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VERY unusual -
I would have expected a B0429 - "standard" on almost ALL Devilles -

did you use the on-board scanner - or a plug-in -
 

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Master of the Dark Art of Diagnostics
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I tried the cycling of the 60 degrees to 90 degrees. It cycles to the lower vents with heat
and upper vents and the A/C t comes on.. It still has a 6 to 10 degree difference.. The only thing I think it could be
is one of the three items the module, the sensor or the mix boor actuator/door..
Have not tried the system reset with the battery terminals..
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I tried the cycling of the 60 degrees to 90 degrees. It cycles to the lower vents with heat
and upper vents and the A/C t comes on.

just like it should when in the AUTO mode -
which is why I suggested to manually select the MODE to dash vents -
 

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Discussion Starter #33
All the temp measurements were in the manual mode to dash vents.. The recycling was done in the auto mode should I have recycled in the manual mode to the dash vents?
 

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Master of the Dark Art of Diagnostics
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All the temp measurements were in the manual mode to dash vents.. The recycling was done in the auto mode should I have recycled in the manual mode to the dash vents?
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if you were just exercising the system - NO - doesn't matter -
it's easier to feel/measure the discharge air temp from the dash vents rather than chasing it down to the floor -
 

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I'm anxious to see the results after pulling the battery cables -
fingers crossed -
 

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Discussion Starter #37
Hi, I was just trying what "RANGER" suggested:


Ranger:
With no codes, you can rule out the sensors.

P.S.
I seem to recall a problem similar to yours on my previous Deville. Excercising the door by running the temp up to 90° and then back down to 60° a couple of times solved the problem.
 

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Discussion Starter #38
I will try the battery cables tomorrow.. Still a little afraid that I could mess up some other programming by doing the battery.. But I guess it is nothing worse than changing a bad battery, usually does not effect anything..
 

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I will try the battery cables tomorrow.. Still a little afraid that I could mess up some other programming by doing the battery.. But I guess it is nothing worse than changing a bad battery, usually does not effect anything..
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Still a little afraid that I could mess up some other programming by doing the battery..
NOPE - can't possibly "hurt" anything -
this action acts just like re-booting your computer -
it clears "volatile" memory only -
has absolutely no affect on radio settings - memory seats - engine idle - etc
 

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Discussion Starter #40
Hi, Did the battery disconnect and shorted out the cable terminals. waited for a few minutes and turned on the ignition. Heard the stepping actuators goiing and after they stopped I started the car. took it for a ride.. Unfortunately same results.. drivers side warm and passenger side cold..
 
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