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Audi A/C Air Conditioner Recharge Procedure

This guide provides instructions on how to charge the A/C system on Audi vehicles. If your A/C is blowing hot air, there is a chance that the system is low on freon, and the system needs to be refilled.

Audi A/C Air Conditioner Recharge Procedure
DIY COST $15-$30


What you will need


  1. Park your Audi in a safe area. Turn off the engine.
  2. Pull the hood release located under the dashboard on the driver's side. Open hood. 

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  3. Locate the low-pressure port. This picture shows the A/C charging port on an Audi A4. audi location of ac charging portNote that there also is a high-pressure line. Don't use that line. The A/C charging kit connector will not fit on the port for the high-pressure line. The A/C kit only fits on the low-pressure port.location of a/c low pressure port on Audi A S Q TT models  3rd
  4. Remove the cap from the low-pressure port of your Audi. diy ac recharge mamo allyr
  5. Connect your A/C hose to the charging port. Get ready to add freon to your Audi A/C system. Audi A S Q TT models  ac recharge diy video allmo allyr
  6. Start the engine and let it idle. how to charge the ac on Audi A S Q TT models
  7. Turn A/C on. Before you can start adding refrigerant, you need to turn A/C on and set it to the max cold setting. Once you start the engine, you are ready to add refrigerant to your Audi air conditioner system.

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  8. Follow the instructions as directed on your particular A/C recharge kit. As you charge the system, stop pressing the trigger every few minutes to obtain a pressure reading. Continue adding refrigerant until your gauge reaches the charged range. Do not allow the system to overcharge. 

These instructions on recharge the Audi A/C system work on :

  • A1
  • A3
  • A4
  • A5
  • A6
  • A7
  • Q3
  • Q5
  • Q7
  • TT.



This is a well explained article. I'll add how if the A/C starts to blow out hot air, it can be a cause of concern and in some cases very dangerous. In some cases it can be a broke condenser, circuit faults or just a leak. If not fixed, these problems can cause big trouble. I'd suggest if you experience this even when you do not need an A/C get this fixed asap. To be more precise on what the issue is, you can use a scanner.


I cannot locate the charge port on my 2017 Q7 Prestige. Can someone point me in the right direction please.


In reply to by Visitor

Open the hood, the low pressure port is on the far right corner. You have to remove the plastic piece closest to the windshield.

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Safety Tips

Auto Repair Safety Notes


Tips on recharging the A/C System

  •  Always wear safety glasses when performing work on the A/C system. 
  • Do not get any refrigerant on your skin as it freezes quickly.
  • Follow all instructions that are included with your AC recharge kit and read every canister’s warnings carefully.
  • Do not release refrigerant on the envrionment.