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.
In this guide, you will find instructions on how to recharge Audi A/C system in various models including A1 A3 A4 A5 A6 A7 Q3 Q5 Q7 TT.
The most common symptom that your Audi is low on refrigerant is that hot air blows even when the temperature is set to cold.
Park your Audi in a safe area. Turn off the engine.
To add freon (R134a) to any 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.
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.
Remove the cap from the low-pressure port of your Audi.
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.
Start the engine and let it idle.
Turn A/C on
Before you can start adding refrigerant you need to turn A/C on and set it to 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.