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Cadillac DeVille Climate Control

57 messages,  Last post on Sep 27, 2009 at 12:42 AM

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What is this discussion about? Cadillac DeVille, Heating / Cooling, Sedan

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#12 of 57 Blower Control Module? by jgael Feb 17, 2007 (7:49 pm)
I have no problem with heat or AC. I just can't get air to flow through the middle vents on the dash. The floor vents and the defrost vents work fine. My 2000 DeVille makes a ticking noise in the middle of the dash when the car is started. I took the bottom dash panels off of both sides and the noise is definitely closer to the driver side, right behind the radio assembly. The ticking noise lasts for about 15 seconds and then quits (seems like a worm gear gets tired of trying). If the temperature is set to "auto" and I lower the temperature from heat to AC, the control module tries to divert the air flow from the floor to the middle dash vents because I can hear the ticking again...but it just can't grab the gear that shuts the damper (diverter) to change the air flow to the middle vents. However, if I send the air flow to the defrost vents, there is no problem. So, is this the blower control module, or is the BCM working fine and it's a problem in some other actuator down the line to moving the damper/diverter in the vent system? Replies to this message: daleorjayne (Mar 21, 2007 6:04 pm)
#13 of 57 Re: Blower Control Module? [jgael] by daleorjayne Mar 21, 2007 (6:04 pm)
Replying to: jgael (Feb 17, 2007 7:49 pm) My 2000 Deville had the same problem three weeks ago. The problem was a stripped damper gear. The gear is plastic and very hard to get to. My mechanic had to do quite a bit of work to get at the gear and replace it. That cost me $300. I did not take it to the dealer because it would probably have been more expensive -- they would probably have wanted to replace a bunch of stuff under the dash. Call your dealer and get a cost to replace the vent damper gear -- the one that controls which vent blows air. An independent mechanic might have a hard time, mine said a job that should have taken an hour took three times that long.
#15 of 57 98 Cad deville airconditioning problem by dewainet Jun 25, 2007 (4:56 pm)
Have a 1998 Caddy Deville with 115,000 miles. Had water hose replaced and mechanic forgot to refill radiator. Car overheated. Topped with coolant and car sat for about 6 months. Went to turn on heater after sitting for six months only to have extremely cold air blowing. After about 10 minutes of blowing cold air, message center says refrigerant low, airconditioner turning off. Seems the heater core unit was inoperable and was pulling the freon from system. Now both the A/C and Heater don't work. Had the car in to the mechanic 3 times and they keep trying to replace A/C seals. Does the heater core and A/C operate off the same system. Right now I just want the darn A/C to work!!! Replies to this message: zimzam1 (Jun 27, 2007 2:34 pm)
#16 of 57 Re: 98 Cad deville airconditioning problem [dewainet] by zimzam1 Jun 27, 2007 (2:34 pm)
Replying to: dewainet (Jun 25, 2007 4:56 pm) dewainet, I am not sure about the heater core and A/C working off the same system but it seems like you have an incompetant mechanic. I will tell you one thing though, if he forgot to put in radiator fluid, it also sounds like he didnt put in the pellets that are supposed to go in with the radiator fluid that prevent the coolant from getting to hot. That is what happened to me, well my mechanic did refill the radiator he just didnt add the pellets, so now I have to deal with a blown headgasket. So make sure when they are refilling your coolant system that they look into those pellets which can be picked up at any cadillac dealership.
#17 of 57 R.D by bullnibler Jul 30, 2007 (4:06 pm)
I have a 1996 sedan deville. ive replaced the a/c compressor,and dryer,and its worked fine for about a month. Yesterday the ac quit working. I noticed the climate control wont go on auto... it stays on econ, the fan works fine and will go on auto. Could this be a problem with the control? I have checked and the 134 is fine although i cant turn the compressor on by bypassing the low pressure cut-out switch. Replies to this message: bolivar (Jul 30, 2007 5:00 pm) bullnibler (Aug 01, 2007 2:27 pm) bolivar (Aug 01, 2007 8:40 pm) and 1 more...
#18 of 57 Re: R.D [bullnibler] by bolivar Jul 30, 2007 (5:00 pm)
Replying to: bullnibler (Jul 30, 2007 4:06 pm) When the high or low pressure control switches sense an out-of-range condition, the AC system will not turn on, it will only operate in the ECON mode, which is non-AC.   There should be an error code set in the system which will tell you what problem the sensors are seeing.   There are other places on the internet which will tell you how to put the dash display into error reporting mode, and show you all errors that have been set.   Overall, your AC has broken again. Replies to this message: bullnibler (Aug 01, 2007 2:27 pm) bolivar (Aug 01, 2007 8:40 pm) KarenS (Aug 02, 2007 6:58 am)
#19 of 57 Re: R.D [bolivar] by bullnibler Aug 01, 2007 (2:27 pm)
Replying to: bolivar (Jul 30, 2007 5:00 pm) Thanks for the reply, any recomendations for a website to check?? Replies to this message: bolivar (Aug 01, 2007 8:40 pm) KarenS (Aug 02, 2007 6:58 am)
#20 of 57 Re: R.D [bullnibler] by bolivar Aug 01, 2007 (8:40 pm)
Replying to: bullnibler (Aug 01, 2007 2:27 pm) I can't post a link to other sites on here.   I've already been slapped silly over this.   It's aganist Edmunds' rules to post links to competing sites.   Google is your friend. Replies to this message: KarenS (Aug 02, 2007 6:58 am)
#21 of 57 Re: R.D [bolivar] by KarenS HOST Aug 02, 2007 (6:58 am)
Replying to: bolivar (Aug 01, 2007 8:40 pm) Actually, we've lightened up considerably on that rule. As long as the link is going specifically to the requested information, we're fine with that. It's the generic, random "go here and join" links to other forums that are frowned upon. Email me if you have any further questions.

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