Question about 1993 Cadillac DeVille
It is possible that the a/c relay is not working, but the most common cause, especially for a car over 10 years old, is loss of refrigerant. When the refrigerant pressure drops too low, an interlock prevents the compressor from running.
You will need to determine what type of refrigerant your Caddy uses since it is a 1993. This was the cutoff year for R-12 refrigerant, which is now banned. Only a licensed a/c shop can recharge an R-12 A/C system, and it is expensive.
Some R-12 systems can be converted to run with R-134a, which is available to the public. The conversion must also be done by a licensed shop, because R-12 may not be released into the atmosphere due to environmental laws- it must be reclaimed and recycled.
If your Caddy uses R-134a, you are in luck, because you can recharge this system yourself, and it is easy and inexpensive to do.
I highly recommend that you start out with a leak check kit, available at any decent auto supply store. It comes with a can of specially treated fluorescent R-134a. After you add the refrigerant (the included instructions with the kit will walk you step by step through the process), you use the included UV penlight and special enhancing glasses to visually find any leaks that may be in your system. The can of refrigerant also contains additives that can seal most small leaks.
As you add refrigerant (following the included instructions, which will tell you to set your A/C on MAX), when the system pressure gets high enough (satisfying the low pressure interlock), the A/C compressor will kick on. Depending on how low the pressure was, you may require another can of 134a to completely fill the system.
Once everything is back up and running, enjoy your A/C! For the first few days, use your light pen and glasses to check for any leaks. Most times, the sealants in recharge can will take care of things for you.
Good Luck, and Thank You for using FixYa!
Posted on May 18, 2011
Or it could just be low freon (R-134a) in order to check your commpressor do you have a DMM
Posted on May 18, 2011
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Posted on Jan 02, 2017
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