A/C - Blows Warm Air On An Extended Drive
SI B64 09 06Heating and Air Conditioning
September 2010
Technical Service
This Service Information bulletin supersedes SI B64 09 06 dated May 2009.
[NEW]designates changes to this revision
SUBJECT
Air Conditioning System Blows Warm Air After Long Drive
MODEL
E90, E91, E92 (3 Series) vehicles produced up to August 15, 2006
E70 (X5) vehicles produced up to February 27, 2009
E71 (X6) vehicles produced up to February 27, 2009
SITUATION
The customer states that the air conditioning system works properly, but after driving on a long trip (approximately more than 1 hour), the system starts to blow warm air. This usually happens under extremely humid conditions. Once the system is turned off for 10 - 15 minutes, the system starts to cool properly.
CAUSE
Hot air leaks between the evaporator and housing wall, past the evaporator sensor, causing the evaporator sensor to read high.
[NEW]PROCEDURE
The contents of this Service Information bulletin have been migrated into ISTA 2.18.0 or later.
1. Perform a vehicle test using ISTA.
2. Complete all test plans that are related to the customer complaint.
3. If no relevant faults are stored, test plan W6450_WAS16 can be found as follows:
^ Highlight the "Activities" tab.
^ Select the "Function Structure" tab.
^ Select "Heating and Air Conditioning" from the list.
^ Click on "start" located on the lower right corner of the display.
^ Select test plan "W6450_WAS 16" from the list of test plans and complete as recommended.
[NEW]CORRECTION
Refer to ISTA diagnosis for the required repair procedure.
[NEW]WARRANTY INFORMATION