D2 A8/S8 (1997 - 2003)
All messages | Search Forums | Return to D2 A8/S8 (1997 - 2003)
You bleed from the upper of the two hoses
Posted by: hyperlogos (20841) on 2017-11-11 11:32:50
In Reply to: Bleed posted by Jake1458 on 2017-11-11 09:44:56

Share | Report
 Switch ignition on.
 Set air conditioner to HI.
 Switch off ignition.
 Open bleeder screw at heating-system heat exchanger approx. 2 turns.
 Put in coolant. Squeezing the top hose several times will help to force out the air.
 Allow engine to warm up. Leave AC set to HI until a coolant temperature of slightly less than 100 C is indicated. The engine is to be warmed up at a speed of between 2000 and 3000 rpm with several brief increases to 4000 and 5000 rpm.
 Stop engine. Wait for about 5 - 10 minutes and then carefully open filler cap on expansion tank (system will be under pressure).
 Top up coolant to max. mark.
 Close filler cap on expansion tank.
 Run engine and repeat topping up procedure as necessary.

But if the valve is good, it's pretty hard to bleed one heater core without bleeding the other. Still, you could get lucky.
post follow up

You must be registered and logged in to post. Please select an option:

Login with existing account
Create a new account

All messages | Search Forums | Return to D2 A8/S8 (1997 - 2003)