A/C - Delayed Operation After Start Up
SI B 64 10 07Heating and Air Conditioning
January 2008
Technical Service
This Service Information bulletin supersedes SI B64 10 07 dated August 2007.
[NEW] designates changes to this revision
SUBJECT
Air Conditioning Delayed Startup
MODEL
E60, E61 (5 Series) with N62, N62TU (8 cylinder) only
E63, E64 (6 Series) with N62, N62TU (8 cylinder) only
Vehicles produced up to 3/2007
SITUATION
The customer states that when starting the vehicle after the vehicle is parked (for a few hours to as much as overnight), there is a noticeable delay (more than 2 minutes) in the startup (cooling) of the air conditioning system. No cold air is felt from the vents for as long as 10 minutes. The blower motor and IHKA (Integrated Heating and Air Conditioner) operate normally. Once the system starts to cool, operation and performance are normal.
CAUSE
A/C compressor
PROCEDURE
1. Connect the BMW Diagnostic tester to the vehicle. Troubleshoot any related faults stored in the system.
2. Perform the following A/C system performance test as per the repair manual RA 64 50 ...
3. Enter IHKA "Control module functions/Diagnosis requests" and display "Evaporator Temperature".
4. Position a thermometer with a separate gauge approximately 5 cm below the headliner at the top of the B-pillar. Position the gauge so that it can be easily read.
5. Start the vehicle and heat up the vehicle interior as follows:
^ The A/C button is not activated during the heating up period.
^ Set the recirculated air mode.
^ Select the air distribution mode for the footwell and defrost.
^ Maximum heat temperature setting.
^ Maximum blower speed.
^ Close all doors and windows.
^ Run the engine at approximately 2000 rpm until the normal engine temperature has been reached, and then continue with idle mode.
6. As soon as an interior vehicle temperature of 50°C (122°F) has been reached, turn on the A/C button to activate the cooling down period.
7. After 3-4 minutes, the evaporator temperature sensor (as read using the DIS/GT1) should read < or = 15°C (59°F).
8. If the desired temperature is not reached, refer to SI B64 03 05 for further troubleshooting hints.
9. If the desired temperature is reached, replace the air conditioning compressor.
[NEW] PARTS INFORMATION
[NEW] WARRANTY INFORMATION
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