Last post on May 16, 2013 at 6:14 AM
You are in the Cadillac DeVille
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Cadillac DeVille, Heating / Cooling, Sedan
#45 of 88 Re: 2004 DeVille Climate Control Issues [wozierski]
Sep 26, 2008 (12:56 am)
On older Cadillacs, a few years older than yours, there are known failures where the blower usually just keeps blowing after the car is shut down. This is usually the blower control/controller unit, which, I think, sits on top of the AC/Heater exchanger unit under the passenger side of the dash. This is the 'box' that controls the auto temp control. Yours is the first time I've hear about the blower goes off when the car is shut down, but comes on some time later.
Ok, read in your owners manual closely about the Heater/AC system. I think there is a section that talks about how the blower will continue to correctly run after shutdown, under certain conditions. But I think it runs only for a couple of minutes or so in this mode. I don't know what these conditions are, but they are an attempt to 'dry out' the system, or some such thing. If you system is supposed to do this, then maybe it is working correctly.
In humid weather, with the AC running, with the car idling and stopped, does water come out of the bottom of the car? Normally, you should get condensation on the AC coil inside the car when running in hot humid weather, and this water comes out of a drain outside the car. If you car does not do this, then the drain is plugged. But, if you have had service done for the smell, they surely should have checked this.
If you get mode growing in the AC coil, it can be very difficult to 'kill' it. This may be what is happening to your car.
#46 of 88 Re: 2004 DeVille Climate Control Issues [bolivar]
Sep 27, 2008 (11:14 am)
Thank you for your comments. I will look into this and post my findings.
#47 of 88 Re: Broken temp gauge and heater is blowing cool air [jknight8787]
Dec 08, 2008 (10:44 pm)
I have the same car with the same problem. Did replacing the outside temperature sensor solve the problem?
#48 of 88 2000 Deville - A/C and Heat work but Middle Blowers won't blow???
Dec 26, 2008 (2:09 pm)
#49 of 88 2000 Deville - A/C and Heat work but Middle Blowers won't blow???
Dec 26, 2008 (2:09 pm)
My feet and the top of my head are cold but I am getting NO air coming out of the middle vents; it also DOES blow in the back seat. When I first start the car the sound that comes out of the middle vents is "tick, tick, tick, etc" for about 4 minutes then nothing... help???
#50 of 88 89 DeVille Blower module
May 09, 2009 (6:43 am)
Just a note, my blower stopped working. I did the required testing and blower motor replacement was the outcome. Before I bought a new motor I bench tested the motor and it worked fine. The blower control module was the problem. Recommended voltage tests did not reveal problem, so beware before you buy.
#51 of 88 auto/econ not working
Jun 06, 2009 (1:35 pm)
Hey, My 96 deville has an issue. When you press the auto/econ button to get it to switch to auto, it will not. It goes right back to econ. This problem seems like it happened over night. Can anyone give us a tip. Thanks in advance.
#52 of 88 Re: auto/econ not working [tripled1]
Jun 07, 2009 (1:49 am)
Econ means the AC compressor is switched off.
Auto means the AC system is switched on.
You have a problem with the AC. One of the high or low pressure sensors detects a problem, and will not let the Auto mode be set.
Fix the AC.
#53 of 88 95 caddy sedan deville AC trouble
Jun 07, 2009 (4:41 pm)
Like its anything new....but I am new to the car and when I got it yesterday you could feel cold air coming from the vents but NOT blowing....then on way home it said "refrigerant low.....ac compressor off" I am assuming that means it shuts the compressor OFF to keep it from being damaged?
also when you press on the fan speed selector...I get nothing.
I tried to add refrigerant but since the system wont kick on it wont cycle to get refrigerant flowing thru it.
HELP!!! Its HOT in AZ and I need this sytem to work as soon as possible.
The rest I can deal with and work on with some leisure...but the switch, the blower and the AC not working...is just frustrating me
thanks a million for help.
BTW...new here but real used to working on MOST cars but this is the first caddy I have ever had so any help be real appreciated
#54 of 88 Re: 95 caddy sedan deville AC trouble [korrupt1]
Jun 08, 2009 (12:55 am)
Yes, if the sensors see high/low pressure, it will not allow the compressor to turn on.
If you could find the places on the internet giving you instructions, you can display and reset the error codes from the buttons on the dash.
If you can't do this, you call pull the negative battery cable for a minute and this will reset the error codes. Then, have your freon hoses all hooked up before you restart the car, and you might be able to turn the AC system on and suck in enough freon before it resets the code. Might have to do this a couple of times to get enough freon in to stop setting the codes. Of course, this assumes you only have a leak and the rest of the AC system works ok.
No idea about the fan.