Cooling System, Checking Coolant Concentration
It is necessary to check the coolant concentration to determine if there is air in the coolant system. If there is air in the cooling system, the coolant level may drop too far through the running time. Overheating the engine is also possible.
Special tools and workshop equipment required
- Cooling System Tester :V.A.G 1274 B
- Cooling System Tester - Adapter :V.A.G 1274/8
Conditions
- Ignition is switched off.
- Coolant temperature between 40 °C and 60 °C (104 °F and 140 °F)
-- Open the cap -arrow-.
-- Check the coolant level, it must be approximately 5 mm -arrow- over the MAX mark. If necessary, fill the coolant.
-- Position the Cooling System Tester :V.A.G 1274 B with the Cooling System Tester - Adapter :V.A.G 1274/8 on the coolant expansion tank.
Courtesy of AUDI OF AMERICA, LLC-- Generate 1.5 bar (21.76 psi) pressure using the cooling system tester hand pump.
-- Check the coolant level inside the reservoir.
If the coolant level in the expansion tank drops more than 30 mm, this means that there is an air bubble in the cooling system. The bleeding procedure must be performed with the Vehicle Diagnostic Tester. Refer to Bleed The Cooling System .
-- After performing the bleeding, fill the ATF to approximately 5 mm -arrow- above the MAX mark.
-- Repeat the coolant concentration check.
If the coolant level in the expansion tank drops lower than 30 mm, the cooling system is correctly filled.