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1993 DeVille 4.9L
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Discussion Starter #1
My A/C doesn't blow cold. How do I fix this? There are no other problems with it as far as I know.

1993 Base Deville 4.9L
 

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93 Sedan Deville 4.9L
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Remember if its original then it is R12 and will take a retrofit, or the use of an alternative refrigerant. I went with an alternative. Drawbacks to this are that most shops will turn you away for any future a/c work if they are not familiar with what you have since it poses some risks to them. Mine worked good for a bit, but leaked out yet again. If you have compressor problems then you may aswell go to 134a as the system will have to come apart to replace the comp.

When adding refreg. you will have to clear any codes to engage the comp and use a proper gauge set to charge into the low pressure side
 

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1993 DeVille 4.9L
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Discussion Starter #4 (Edited)
I haven't pulled any codes yet, doing that tomorrow.
And does anyone know if the R12 refrigerants being sold on eBay are legitimate? and Yes I'm aware of the legalities behind R12 refrigerant
 

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1999 Cadillac DeVille
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279 Posts
IF the compressor is functioning properly, I would begin checking the system for leaks you can buy leak identifying dye at any auto parts store, if the system is leaking then repair the affending part, then vaccuum the system down and recharge with fresh freon.
 

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1992 Sedan Deville, 1984 Lincoln Town Car
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I haven't pulled any codes yet, doing that tomorrow.
And does anyone know if the R12 refrigerants being sold on eBay are legitimate? and Yes I'm aware of the legalities behind R12 refrigerant
I think its a code f47 for low refrigerant. I have done excruciating research re: this and the winner for me as soon as I can afford is called Freeze 12. You can get it on Ebay or direct from the distributor. Haven't seen it in the Napa or Checkers auto parts tho'.

http://www.freeze12.com/

My understanding about 134a is that it is not compatible with the Cadillac compressor and will cause it to fail sooner than expected so you'd have to get a whole new compressor, etc. I also read the opinions from this forum from some Cadillac owners that it will not cool as well as the R12.
My Lincoln uses the 134a and it is a snap to add the cans for a recharge myself. Like anything chemical just follow the safety precautions to avoid injury.
 

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2010 DTS
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And does anyone know if the R12 refrigerants being sold on eBay are legitimate?
Probably is, but they are going to ask for your certification number before they sell you any. Without one, I doubt anyone would sell it to you.

My understanding about 134a is that it is not compatible with the Cadillac compressor and will cause it to fail sooner than expected so you'd have to get a whole new compressor
It's not the refrigerant, it's the oil that is not compatible and must be flushed and changed.
 

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1993 DeVille 4.9L
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Discussion Starter #8
Probably is, but they are going to ask for your certification number before they sell you any. Without one, I doubt anyone would sell it to you.
Well, that was what I thought too, cause I noticed on all of the auctions, they said you have to provide your certification number before payment, but they all also said this right after. "If you don't have a certification number, send us a signed document or an e-mail stating you agree to sell this refrigerant to a certified technician and it is not for personal use."
 

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I saw freeze 12 available locally in one parts store (has since closed down) and asked them about it, they still wanted me to prove I was EPA cert before I could buy it... My understanding was that freeze 12 still contained a fair bit of r134, but had other refrigerants mixed in that would carry the old oil from the R12 to prevent seizing the compressor. Never having used it I am not certain though. One thing you can have problems with when using a blended refrigerant like that is each refrig. leaking at a different rate which could make topping off and keeping the proper ratios impossible. Each recharge would really need to be to an empty system.

I found a product on ebay called "envirosafe" that I had pretty good luck with. It has dye in it already to help aid leaks. It cools great, but unfortunately my system is still too leaky so it only last a few weeks. My system holds a good vacuum though so finding the leak is proving to be a chore. Too not be "deceptive" be aware that envirosafe and other products made with the same mix contain flammable material, ( Not sure about the above mentioned freeze 12). Personally I have never seen or heard of anyone injuring themselves solely due to that. People say their could be a deadly "kaboom" if you got in an accident, but I dont really buy that. I would be much more worried about the 18gallons of gas blowing up then the few ounces or low pressure flammable a/c refreg. that is in a closed system. Just be aware though.
 

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1990 350 Brougham (The cruiser), 1988 Mark VII LSC (The DD)
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Freeze 12 will work with the old oil but you must be careful adding it. There are so many things you can screw up rather easily on an A/C system if you do not know what you are doing. I just spent an entire semester in an Automotive HVAC class and learned a lot of information. Pick up a DVD if you can, I know they sell them at Autozone and Advanced. It will not tell you everything you need to know but it will inform you on what NOT to do so you don't destroy your A/C system.

Also, once you put Freeze12 in your car you will not find a shop willing to work on it. Federal laws say that all systems have to be evacuated and the refrigerant collected before starting work. Shops remove the refrigerant and recycle it, putting it back in the car after the work is done. However, if you have anything other than R12 or R134 they will NOT remove it because it will contaminate their equipment and the other refrigerant in the cylinders. Another thing not to add is the leak stop. After you add that the entire system must be replaced if anything ever goes wrong because that shit clogs up everything. I highly recommend having a shop convert it to 134.
 
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