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A/C Troubles


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I have a air conditioning problem. I do not believe that my sytem has a leak but my A/C is not blowing cold as every car owner desires. The compressor works and engages when signaled to. What can I do or check, to fix this problem. My heater does not work either, but it is near summer time here, so the A/C is my only concern right now. Any tips would be helpful.

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I have a air conditioning problem. I do not believe that my sytem has a leak but my A/C is not blowing cold as every car owner desires. The compressor works and engages when signaled to. What can I do or check, to fix this problem. My heater does not work either, but it is near summer time here, so the A/C is my only concern right now. Any tips would be helpful.

Every couple of years I have my AC evacuated and recharged. Its about a $100 to $175 expense, depending if I need freon. I get a little oil and dye and I am good to go and it puts you out of the car it's so cold. Have you ever had yours evacuated and recharged by an AC shop or radiator shop that is familiar with AC? It just seems to me that you need freon. I am NOT a big fan of adding the cans, it might bide you some time or a few degrees cooler, but the way to go is as I described above.

That is of course, if you don't have the equipment and experience to do it yourself, I don't.. KHE and a few others are good with AC, and I am sure they will chime in. Logan, recently said it was easier for him to disconnect and recharge the AC system than to move it all around when he lowered an engine carriage.. Many members are familiar and can do this themselves. Not me.

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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It sounds like the mixer doors are stuck or the vacuum hoses are off. I think it's time to run the OBD II codes and look at them.

http://www.caddyinfo.com/readingcodes.html

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May I ask this question? If the compressor is engaged, can it still be a problem if I am not recieving cold air

Yes. If you have a blend servo problem like a 1340 code, you will not get cold air, you will get whatever the door is LOCKED at. It happened to me over the summer.

I missed it, but you said your heater does not work either. If your blend door is locked you will not get good heat either.

Check your codes...

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Also, you can buy refrigerant that is up to 50% more efficient and makes colder air. Wal-Mart sells it.

:bsmeter:

The only refrigerant that is recommended for the system is plain R-134a.

Kevin
'93 Fleetwood Brougham
'05 Deville
'04 Deville
2013 Silverado Z71

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I just looked at my 91 Seville AC section of the FSM. I don't believe the AC system will set a code for the AIR MIX VALVE. The AIR MIX VALVE is moved by the programmer. See this scan. If I recall, the programmer is below/behind the glove compartment. While you roll the temp control from 60 to 90 degrees and back, keep and eye on it, it should move from FULL HEAT to FULL AC.. Mike

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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If your pipes are cold, the fan is running, and you have air flow out of the vents, I believe the air mix door is either stuck, or stopped half way between heat and ac. Do you get strong air through the vents? and its just warm? Are the pipes cold?

I will post that scan, PHOTOBUCKET is slow as SH** tonight.

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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If your pipes are cold, the fan is running, and you have air flow out of the vents, I believe the air mix door is either stuck, or stopped half way between heat and ac. Do you get strong air through the vents? and its just warm? Are the pipes cold?

I will post that scan, PHOTOBUCKET is slow as SH** tonight.

If you mean the pipes that are on the Accumulator then yes, one of the pipes are cold and the accumulator is cold too, but the pipes at the firewall are hot. And yes the air does blow strong, but there is just no temperature to it, not warmth nor cool. Question. So even if the air that blows changes vents correctly when I change the temperature, the mixer doors can still be stuck, are they different from the doors that change the air direction?

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If your pipes are cold, the fan is running, and you have air flow out of the vents, I believe the air mix door is either stuck, or stopped half way between heat and ac. Do you get strong air through the vents? and its just warm? Are the pipes cold?

I will post that scan, PHOTOBUCKET is slow as SH** tonight.

If you mean the pipes that are on the Accumulator then yes, one of the pipes are cold and the accumulator is cold too, but the pipes at the firewall are hot. And yes the air does blow strong, but there is just no temperature to it, not warmth nor cool. Question. So even if the air that blows changes vents correctly when I change the temperature, the mixer doors can still be stuck, are they different from the doors that change the air direction?

Thats good, the pipes behind along the firewall are hot that's ok, if its cool by the accumulator, thats good. Good fan, good air flow, that's good.

Yes, there is a are doors/servos for defrost / heat / vents / bi level AND an air temp door. Once I post the photo you will see. When the air MIX door is fully one way, only AC cooled air can come in from the AC evaporator, when its fully the other way, ONLY heated air comes in from the heater core, IF the door gets STUCK or STOPPED between the two sources (heat and AC) you will get a mix of ac and heat. If you think about it, that is how the Cadillac AC system is able to deliver 68 degrees, it moves the air mix door to a position to deliver 68 degrees, if 70 is needed, it lets in more warm air, if 66 is needed it lets in more cool air.. If that door gets STUCK on 70 degrees, you get 70 degrees constant.

First lay on the floor of the passenger seat with a flash light, you might be able to see the programmer's arm at the top move or NOT move when you roll the TEMP control up and down. You might need to pull the glove compartment out to get a better look. IF you are lucky, the rod fell off. Mike

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Here is that scan, hope this helps.

Programmer49Class.jpg

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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The pressures will vary depending on outside temperature and humidity. There is a chart in the FSM.

I thought i just saw a question from kjelie8706 about the pipes but it's gone. But to continue his inquiry, will both of the pipes feel cold on the accumulator, everytime the A/C is turned on

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The pressures will vary depending on outside temperature and humidity. There is a chart in the FSM.

I thought i just saw a question from kjelie8706 about the pipes but it's gone. But to continue his inquiry, will both of the pipes feel cold on the accumulator, everytime the A/C is turned on

The accumulator has dissecant in it which basically I understand removes moisture from the system. The pipe IN, OUT and the accumulator will usually feel cold. Everything AFTER the ORIFICE TUBE should feel cold..if I am not mistaken.

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Ok, so i pulled out the glove box, and found out that i needed to change the the actuator. the doors was stuck in the middle, so now that i changed it, the air mixer doors works fine but now i have another problem, my compressor will no longer engage. I dont undertstand this car, i fix one thing and then something else stops working. Should i check and where can i buy those fuses that are for the compressor and etc, the ones found under the chassis in the engine compartment

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Disconnect the battery, and see if it re-engages. In addition check for codes. I don't know what fuse you found under the chassis, are you sure you ae not looking at the DIODE that is near the compressor connection to stop electrical feedback?, its on the compreser power line.

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Disconnect the battery, and see if it re-engages. In addition check for codes. I don't know what fuse you found under the chassis, are you sure you ae not looking at the DIODE that is near the compressor connection to stop electrical feedback?, its on the compreser power line.

i've decided to give up on this endeavor. I just took a recent trip in the STS from FLORIDA TO NC. I decided to turn on the heater and half way thru the trip I start to smell something burning, and I realise that the heater is no longer giving heat or anything. And besides that I got poor gas mileage. I AVG 18.5 miles and thats highway. I spent nearly $600 dollars on gas for the trip to and from. And I had no a/c or heater. It's time to upgrade

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