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This guide provides instructions on how to re-charge the Cadillac Air Conditioner (A/C) system with refrigerant (R134a freon).

If the A/C is blowing hot air, there is a good chance that the system is low on freon.

Table of Contents



One of the most common symptoms that your Cadillac is low on refrigerant is the A/C blowing hot air even when the temperature is set to cold settings.

What you will need


  1. Park your Cadillac in a safe area. Turn off the engine.

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  2. Pull the hood release under the dashboard until you hear your Cadillac hood pop open. Open the hood.

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  3. Next, locate the low-pressure port. Label 11 in this picture shows where the A/C charging port is on a Cadillac. Note that there also is a high-pressure line as well. The A/C charging kit connector will not fit on the port for the high-pressure line. location of a/c low pressure port on Cadillac  3rd
  4. Carefully remove the cap from the low-pressure port by twisting it counterclockwise. diy ac recharge mamo allyr
  5. Connect your AC charging kit to the A/C charging port. You are almost ready to add freon to your vehicle A/C system. Don't start adding refrigerant to your Cadillac A/C system yet.  Cadillac  ac recharge diy video allmo allyr
  6. Start the engine of your car and allow your Cadillac to idle. how to charge the ac on Cadillac
  7. Next, turn A/C on and set it to the max cold setting. Set the blowing fan to maximum speed. Now you are ready to start adding refrigerant to your Cadillac air conditioner system.

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  8. Now you are ready to start adding refrigerant to your Cadillac air conditioner system. 
  9. Add refrigerant as directed by the manufacturer of the A/C recharge kit you are using. You will need to press and hold the trigger until your Cadillac A/C is fully charged. This process can take several minutes.
  10. When the a/c system is low on freon, the compressor may not be engaged at first. As you add refrigerant, you should hear the compressor kick in. As you charge, the system stops pressing the trigger every couple of minutes to obtain a pressure reading. Continue adding refrigerant until your gauge reaches the charged range.

Do not allow the system to overcharge.

This procedure will only be useful if your Cadillac air conditioner has a very slow leak. If your system has a large refrigerant leak, recharging the system won't fix the problem. You will lose the refrigerant immediately or within a few days. 

Charging a Cadillac A/C system with refrigerant is easy and takes about 15 minutes.

These instructions will help the owners of Cadillac ATS, CTS, XTS, CT6, XT5, Escalade, SRX, DTS, STS, BLS, XLR vehicles, and other models.

The only difference between various Cadillac models is that the A/C charging port is located in different places in the engine bay.