Coolant, Adding And Cooling System, Bleeding, High-Voltage System Cooling Circuit

Special tools and workshop equipment required

Cooling System Tester: VAG1274B

Fig 1: Cooling System Tester VAG1274B
Courtesy of AUDI OF AMERICA, LLC
Cooling System Tester - Adapter: VAG1274/8

Fig 2: Identifying Cooling System Tester Adapter
Courtesy of AUDI OF AMERICA, LLC
Protective Eyewear
Safety Gloves

Procedure

CAUTION:

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.

Coolant may only be added when the collected coolant volume is less than 500 ml when replacing components.

-- Drain and fill the coolant for the high-voltage system cooling circuit only if the coolant loss is greater than 500 ml. Refer to COOLANT, DRAINING, HIGH-VOLTAGE COOLING CIRCUIT and Refer to COOLING SYSTEM, FILLING, HIGH-VOLTAGE SYSTEM COOLING CIRCUIT .

-- Cut the tab on the seal -3- and open the coolant expansion tank cap -1- for the high-voltage system cooling circuit.

Courtesy of AUDI OF AMERICA, LLC

-- Add coolant.

-- Position the Cooling System Tester: VAG1274B with the Cooling System Tester - Adapter: VAG1274/8 on the coolant expansion tank.

Fig 3: Identifying VAG1274B & VAG1274/8

Courtesy of AUDI OF AMERICA, LLC

-- Create a pressure of 1 bar (14.5 psi) using the hand pump on the cooling system tester.

-- Connect the Vehicle Diagnostic Tester.

-- Switch the ignition on.

-- Select and start the Diagnostic operating mode.

-- Select the Test plan tab.

-- Select the Select individual test button and select the following tree structure consecutively:

-- Start the selected program and follow the instructions on the Vehicle Diagnostic Tester display.

Continuation of the Filling Procedure: