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By YOUCANIC on May 24, 2019

How to re-charge Audi Air Conditioner A/C

In this guide, you will find 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.


The most common symptom that your Audi is low on refrigerant is that hot air blows even when the temperature is set to cold.

What you will need


Park Vehicle

Park your Audi in a safe area. Turn off the engine.


Open hood

To add freon (R134a) to an Audi, you need to open the hood of your car. The hood release is located under the dashboard on the driver's side.

Locate A/C port

Locate the low-pressure port. This picture shows the A/C charging port is on an Audi A4.


audi location of ac charging port

Note 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

Remove cap

Remove the cap from the low-pressure port of your Audi.

diy ac recharge mamo allyr

Connect A/C recharge kit

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

Start Engine

Start the engine and let it idle.

how to charge the ac on Audi A S Q TT models

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.


Charge Audi A/C

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

These instructions on how to recharge Audi A/C system work on A1 A3 A4 A5 A6 A7 Q3 Q5 Q7 TT. 


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