Audi Q3 Owners & Service Manuals

Audi Q3: Checking coolant

Checking and Filling
Fig. 150 Engine compartment - coolant expansion tank (diagram): 1 cover; 2 markings

Observe the safety precautions.

Checking the coolant level

  • Park the vehicle on a level surface.
  • Switch the ignition off.
  • Open the hood.
  • Check the coolant level in the coolant expansion tank fig. 146 using the outer markings 2 fig. 150. The coolant level must be between the markings 2 when the engine is cold. When the engine is warm it can be slightly above the upper marking.
  • When you add coolant to the expansion tank.

Adding coolant

Requirement: there must be a residual amount of coolant in the expansion tank.

If you must add coolant, use a mixture of water and coolant additive. Audi recommends mixing the coolant additive with distilled water.

  • Allow the engine to cool.
  • Place a large, thick towel on the coolant expansion tank cap.
  • Remove the cover 1 fig. 150 carefully to the left.
  • Add the correct mixture ratio of coolant up to the upper marking 2 fig. 150.
  • Make sure that the fluid level remains stable.

    Add more coolant if necessary.

  • Screw on the cap securely to the right.

Coolant loss usually indicates that there is a leak.

Immediately drive your vehicle to an authorized Audi dealer or authorized Audi Service Facility and have the cooling system inspected. If the cooling system is not leaking, coolant loss can result from the coolant boiling due overheating and then being forced out of the cooling system.


  • The engine compartment in any vehicle is a potentially dangerous area. Stop the engine, switch the ignition off, and allow the engine to cool before working in the engine compartment.
  • Never open the hood if you can see or hear steam or coolant escaping from the engine compartment. This increases the risk of burns. The cooling system is under pressure.

    When you no longer see or hear steam or coolant escaping, you may open the engine compartment with caution.

  • When working in the engine compartment, remember that the radiator fan can switch on even if the ignition is switched off, which increases the risk of injury.
  • Coolant additive and coolant can be dangerous to your health. For this reason, store the coolant in the original container and away from children. There is a risk of poisoning.


Do not continue driving if the coolant expansion tank is empty. Do not add any coolant, because air could enter the cooling system and damage the engine. See an authorized Audi dealer or authorized Audi Service Facility for assistance.


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