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This guide provides instructions on checking the engine coolant on an Audi and adding the recommended antifreeze if the level is low. 

When the Audi engine coolant level is low, there will be a warning on the dashboard that shows the temperature light and says: "Check Coolant! See owner's manual". 

Table of Contents


audi check engine coolant warning overheating

Do not ignore the engine coolant warning on an Audi or drive with the light on. 


  • Do not open the radiator or coolant expansion cap when the engine is hot.
  • Allow the engine to cool down.

What you will need

  • Audi Engine Coolant
    • Only use Audi recommended engine coolant listed in your owner's manual. Typically it is VW G13 or  G12 engine coolant.
    • It is not recommended to use a store-bought coolant. It may not meet the specifications of an Audi cooling system. 
    • If you decide to use a store-bought coolant, make sure to flush the system with the correct coolant as soon as possible. 
    • Audi  /VW coolant comes in a concentrated form.
    • Dilute the coolant with distilled water, 50/50.


  1. Park your Audi on level ground and set the parking brakes.

    park audi to check engine coolant


  2. Allow the engine to cool down. Once the engine has cooled down, you can proceed by opening the hood.

    audi engine coolant warning


  3. Pull the lever until you hear the hood pop open. Next, you need to release the hood safety latch at the front of the car.

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  4. Locate the translucent engine coolant expansion reservoir. location of audi engine coolant reservoircheck low coolant level A3, S3, RS3, A4, S4, A5, S5, A6, S6, A7, S7, RS7, A8, S8, Q3, Q5, SQ5, Q7, TT, R8  
  5. Look at the side to determine the current level. audi max and min coolant level
  6. If the level is low, slowly remove the cap by turning it counterclockwise. Do not remove the cap if the engine is hot. audi coolant reservoir
  7. Add engine coolant to bring the level between the MIN and MAX marks. Only add the recommended Audi coolant type mixed at 50 % antifreeze and 50%  distilled water. 

These instructions apply to Audi A3, S3, RS3, A4, S4, A5, S5, A6, S6, A7, S7, RS7, A8, S8, Q3, Q5, SQ5, Q7, TT, R8.

Losing coolant frequently can be a sign of a serious problem. Get your Audi diagnosed by a local automotive mechanic as soon as possible. 


  • What color is the Audi engine coolant? 
    • Audi engine coolant is typically pink. VW G12 coolant specification is pink. 
  • What is the recommended coolant/water ratio for Audi? 
    • Mix Audi engine coolant with distilled water at a 50/50 ratio on all USA models.
    • Mixt at 60/40 ratio for all Canadian models. 
  • What to do if your Audi engine coolant light comes on? 
    • Check the engine coolant level. 
    • If the level is correct, the problem may occur due to a bad coolant level sensor. 


Common symptoms that could be caused by low coolant level include: 

  • Engine Overheating
  • The temperature gauge in the HIGH range,
  • Check Coolant Warning,
  • Low Engine Coolant Message