Cooling System Bleeding Audi A6 C4

1. Open heater hose bleed screw. (Scheme 2) Open bleed screw on coolant pipe, next to coolant temperature sensor. (Scheme 3) Fill cooling system through expansion tank until coolant comes out of vent holes. Tighten heater hose and coolant pipe bleed screws.
2. Fill expansion tank to proper level. Install expansion tank cap. Start engine and raise engine speed to 2000 RPM for about 3 minutes. Ensure cooling fan operates. Return engine to idle. Check coolant level in expansion tank. Fill as necessary.

Scheme 2

Scheme 3