A/C - Stops Cooling After a Long Drive
SI B 64 04 05Heating and Air Conditioning
October 2009
Technical Service
This Service Information bulletin supersedes SI B64 04 05 dated August 2007.
[NEW] designates changes to this revision
SUBJECT
Air Conditioning Stops Cooling After Long Drive
MODEL
E60, E61 (5 Series)
E63, E64 (6 Series)
SITUATION
The customer states that after an extended drive, the air conditioning stops cooling and starts to blow warm air. This usually happens when the weather is very humid or there is a high level of air pollution.
Normal operation is restored after the system is turned off for approximately 15 minutes.
CAUSE
The air conditioning system temperature regulation is calibrated between 33.4�F (0.8�C) and 34.5�F (1.4�C). Under certain environmental conditions, ice may form on the evaporator, causing loss of air conditioning performance.
PROCEDURE 1: VEHICLES PRODUCED UP TO 3/2006 WITH A DATA STATUS OF E060-05-12-510 OR LOWER
Using ISTA D2.13 or higher, perform the following Service Function:
The IHKA system must have no faults. Troubleshoot and correct any stored faults in the IHKA before performing this service function.
1. With the introduction of this service function, the temperature calibration can be raised to 36.3�F (2.4�C). Note: this calibration will need to be performed after every software update until the release of Progman V21, which will not reset the evaporator settings to the original factory settings.
2. Perform a short test on the vehicle, using DIS V46/ISTA 2.13 or higher.
3. Correct any faults stored in the IHKA system.
4. [NEW] Select "Activities".
5. Select "Service Functions".
6. Select "Body".
7. Select "Heating and Air conditioning function".
8. Select "Evaporator control".
9. Select "Operating parameter of evaporator temperature", the "test plan".
10. "Operating parameter of evaporator temperature S6450_50002" is shown as the test plan (page right).
11. "Note on PuMA measures: AG 4973857-01. The evaporator operating temperature has not yet been adopted" is displayed in the green screen. Page right and continue with step 13 of this procedure.
12. If a different message is displayed, for example, "If necessary, the evaporator operating temperature can be adapted only by way of coding", this is an error in the diagnosis program and the service function cannot be performed. Proceed to Procedure 2 if this message appears.
13. On the next page, "PuMA measures for adapting the evaporator operating temperature" is displayed. Select "[1] Perform evaporator operating temperature adaptation procedure" and page right.
14. "Note on PuMA measures: AG 4973857-01. The evaporator operating temperature has been adopted" is displayed when the service function is completed successfully. Page right and end the test plan.
15. Check the functionality of the air conditioning system.
PROCEDURE 2: VEHICLES PRODUCED FROM 3/2006 OR WITH A DATA STATUS OF E060-06-03-510 OR HIGHER
1. Program the vehicle using ISTA/P 2.34.2 or later.
2. Note that ISTA/P will automatically reprogram and code all programmable control modules that do not have the latest software.
3. For information on programming and coding with ISTA/P, refer to CenterNet / Aftersales Portal / Service / Workshop Technology / Vehicle Programming.
4. [NEW] Select "Vehicle".
5. Select "Conversion, raise evaporator temperature".
6. Follow the on-screen instructions to finish the retrofit coding.
7. Check the functionality of the system.
[NEW] WARRANTY INFORMATION
Covered under the terms of the BMW New Vehicle Limited Warranty.
Defect Code: 64 11 64 14 00
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