A/C, Cooling Sys- Poor Or No Heating In Any Or All Heating Zone
80 Poor or no heating in any or all heating zones19 12 31
2016703/4
February 29, 2012.
Supersedes Technical Service Bulletin Group 19 number 10 - 03 dated June 2, 2010 for reasons listed below.
Affected Vehicles
Condition
Poor or no heating in any or all heating zones of the vehicle.
W12 only: ECM software updated with modified map-controlled coolant thermostat specifications. The TCM software must also be updated to be compatible with the new ECM software level.
Check vehicle campaign history to see whether UPDATE IJ or UPDATE IK was performed. If UPDATE IJ00 or UPDATE IK00 was performed, no further repairs are allowed by this TSB.
Technical Background
Possible engine coolant scaling in HVAC system.
Production Solution
Improved internal heater core coating.
Service
Silicate Cartridge Installation
Warning:
Hot steam and/or hot coolant can escape when the expansion tank is opened. Wrap a cloth around the filler cap and open carefully.
1. Open the coolant expansion tank and insert the first of the four silicate cartridges (Figure 1, 1) into the expansion tank.
2. Press each of the cartridges (Figure 2, 1) carefully past the MIN mark (Figure 2, 2) in the tank without damaging the silicate cartridge.
3. The correct positioning of the silicate cartridges is depicted in Figure 3.
4. On vehicles on which the coolant expansion tank has no MIN mark, the four silicate cartridges should be positioned as shown in Figure 4. Two silicate cartridges (Figure 4, 3) are inserted in one chamber of the tank.
SVM Update Instructions
1. Follow all instructions in the attached TSB 2011732 00 Software Version Management (SVM), operating instructions.
2. Update the ECM (J623) using the SVM action code as listed in the table above if necessary.
3. The test plan will automatically load the new software container(s) from the AoA server to the tester. During the flash, you will be asked: Do you want to view changes that have taken place? Choose option 1 to view changes and print screen with confirmation update. Attach screen print(s) to vehicle service file.
4. The program may loop back for or suggest additional updates to other control modules. Ignore other suggested updates and use prompt to continue. Do not exit the session. This TSB does not cover time expended on updating (flashing) modules not explicitly stated in this bulletin.
5. At prompt to print GFF diagnostic report, choose Yes. Print long version of diagnostic report, and attach printout to vehicle warranty file
Warranty
Required Parts and Tools
The following Technical Service Bulletin will be necessary to complete this procedure:
^ TSB 2011732 00 Software Version Management (SVM), operating instructions.
All part and service references provided in this TSB are subject to change and/or removal. Always check with your Parts Dept. and service manuals for the latest information.
Attachments
^ TSB 2011732 00 Software Version Management (SVM), operating instructions.