Cooling System - Coolant Loss Due To Excessive Pressure
19 08 052017940/1
August 6, 2008
Vehicle Information
Coolant loss because of excessive coolant pressure - 6.0L
Condition
Coolant loss because of excessive coolant system pressure.
Technical Background
Certain driving conditions lead to excessive pressure in the coolant circuit. This can lead to leaks on the hose connections or the main radiator.
Production Solution
Bypass solution to reduce pressure in the coolant circuit.
Service
Reroute coolant hose
1. Put lock carrier in service position.
2. Remove the two pre-installed clips from the bypass coolant hoses (Figure 1, 1).
3. In this step, use new parts:
^ New coolant hose, Part Number 4E0 121 101 BP.
^ New bypass hose, Part Number 4E0 121 445 AB.
Attach the bypass hoses with 2 clips (Part Number 701 422 921) to the ventilation hose.
Tips:
^ If necessary, install a new spring clip (Part Number N 906 869 01 (B23x12) or N 906 870 01 (B27x12)).
^ Attach the coolant hoses and bypass hoses with 2 clips (pre-installed on the coolant hoses by the supplier) to the secondary air hose.
SVM Update Instructions
ECM software should be updated for additional reduction in coolant system pressure.
The TCM must be updated at the same time to prevent compatibility issues.
1. Follow all instructions in the attached TSB 2011732 Software Version Management (SVM), operating instructions.
2. Update the ECM software of the affected vehicles using the SVM action codes listed in the table.
Warranty
When procedure applies to vehicles under warranty, use the following:
SAGA
All warranty claims submitted for payment must be in accordance with the Audi Warranty Policies and Procedures Manual. Claims are subject to review or audit by Audi Warranty.
Required Parts and Tools
Additional Information
All parts and service references provided in this TSB are subject to change and/or removal. Always check with your Parts Department and service manuals for the latest information.