2001 Deville pass. HVAC problem

MARKTAYLOR_254

MEMBER
2001 CADILLAC DEVILLE

I have a 2001 cadillac deville and im having an issue with my passenger hvac system. My driver-side blows like a fan and my passenger blows HOT! Ive tried using a freon restoration kit but I still cant get the passenger-side to blow cold. Sometimes it does turn cold but majority of the time its hot-- Is there any way to disable the passenger-side vents or maybe a solution to this problem. Very desperate for solutions, I live in Texas so you can imagine how HOT it is right now, especially without good a/c. Thanks to anyone reading this post.

5 Replies

FACTORYJACK

MECHANIC
4,159 POSTS

Does the driver side cool at all, or just blow ambient? It sounds like you could have an actuator fault, but you could also have a base HVAC system fault as well. You can enter diagnostics on your vehicle to display fault codes, and if you have an actuator fault, it could have a code. Start with key on, by pressing the info button up, and on/off at the same time and holding. Eventually(within several seconds) it should illuminate all display, and you can release the buttons. The info center will eventually read ALL, when it does, press on/off again. The display should now read ALL CODES, press on/off again. What will happen, is all codes from all modules will display, in alphabetical order by module. IPM is the module we are most concerned with at this time. Record the codes and reply to this post. If you do not get them on the first run, just turn the key off and start over. You can not do any harm, unless you execute a clear codes command, and that takes more steps.

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Wednesday, July 27th, 2011 AT 5:17 AM

MARKTAYLOR_254

MEMBER
21 POSTS

I didn't know the new model cadis had an onboard diagnosis center. I used to own a 90 deville and it really helped especially b/c everything switched to obd2 standards, but my driver side vents blow ambient. I haven't got around to diagnosing it yet but I will check it out today and reply back with codes. Thanks

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Sunday, July 31st, 2011 AT 3:50 PM

FACTORYJACK

MECHANIC
4,159 POSTS

It sounds like at a minimum, you have low/no refrigerant, a compressor that is not functioning(it may be engaging but not compressing), or a faulty expansion device. Without having the equipment to recover and weigh what is removed, you have no idea what exists in the system. The same as when you charge it, I don't know what this freon restoration kit is, but it is not working. With a system like air conditioning, it is most economical in the long run, if you have it serviced/inspected by a facility that is equipped to diagnose/repair it.

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Sunday, July 31st, 2011 AT 3:59 PM

MARKTAYLOR_254

MEMBER
21 POSTS

Codes:

IPM B0419
IPM B0429
IPM B1004
RCC B1009
RCC U1000

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Wednesday, August 3rd, 2011 AT 2:25 AM

FACTORYJACK

MECHANIC
4,159 POSTS

The 419 and 429 are the ones that would relate to your fault. The 429 is a fa for the auxiliary temp control, which is part of the right actuator that is referenced in the 419. At first glance, I would suspect that actuator is bad. The 1004 is an internal module failure code, and if current, suggests replacement of the module that is setting the code, in this case the IPM. If it is history, I would disregard it at this point. I would still wager that there is another concern with the base A/C system, since the driver side blows ambient when commanded cool. It probably blows hot when commanded hot, correct?