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Home >> Audi >> 2025 >> S4 Premium >> Repair and Diagnosis >> Engine Mechanical >> Cooling System (Mechanical) >> Cooling System (6-Cylinder Direct Fuel Injection 2.9L; 3.0L 4V TFSI Engine) >> 19 Cooling System >> Cooling System/Coolant >> Coolant, Draining And Filling >> Coolant, Draining And Filling, 2.9L Engine >> Notes

Coolant, Draining And Filling, 2.9L Engine: Notes

Special tools and workshop equipment required 

Drain the coolant

GWWA10-12006Courtesy of AUDI OF AMERICA, LLC

-- Release the retainers -B arrows- and open the cover -1- -arrow A-.

WARNING:

The cooling system is under pressure when the engine is warm. There is a risk of scalding due to hot steam and hot coolant.

Scalding the skin and other parts of the body is possible.

  • Wear safety gloves.
  • Wear protective eyewear.
  • Reduce the pressure by covering the coolant expansion tank cap with a cloth and carefully opening it.

-- Open the coolant expansion tank cap -1- by releasing the catch -arrow-.

Fig 7: Coolant Expansion Tank
GWWA19-12304Courtesy of AUDI OF AMERICA, LLC

-- Remove the noise insulation. Refer to NOISE INSULATION, REMOVING AND INSTALLING .

-- Place the Shop Crane - Drip Tray :VAS 6208  underneath.

GWWA19-12532Courtesy of AUDI OF AMERICA, LLC
WARNING:

There is a risk of injury if the radiator fan turns on by itself.

  • The radiator fans can come on by itself even when the ignition is turned off, such as when heat builds up in the engine compartment.

-- Lift the clamp -arrow- and remove the coolant hose from the radiator and drain the coolant.

-- Loosen the hose clamps -2 and 3-, remove the coolant hoses and let the coolant drain out.

GWWA19-12719Courtesy of AUDI OF AMERICA, LLC

-- Open the hose clamp -arrow-.

GWWA19-12714Courtesy of AUDI OF AMERICA, LLC

-- Remove the coolant hose from the ATF cooler, hold it downward, and allow the coolant to drain.

-- Reattach the coolant hoses. Refer to Figure for version with a connector coupling.

Coolant Specification

All information is described under: COOLANT, DRAINING AND FILLING .