Cooling System Bleeding Audi A4 B5

1. Expose vent hole on heater pipe at firewall connection by pulling back heater hose. (Scheme 2) Open bleed screw on coolant pipe below expansion tank. Fill cooling system through expansion tank until coolant comes out of vent hole. Tighten heater hose and bleed screw.
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