A/C - Compressor Noise Troubleshooting

2010 BMW 335Cic Convertible (E93) L6-3.0L Turbo (N54) Technical Service Bulletin # 642105 Date: 100501

A/C - Compressor Noise Troubleshooting

SI B 64 21 05

Heating and Air Conditioning

May 2010

Technical Service

This Service Information bulletin supersedes SI B64 21 05 dated May 2008.

[NEW] designates changes to this revision

SUBJECT

Troubleshooting Air Conditioning Compressor Noise

MODEL

All

SITUATION

A high percentage of air conditioning compressors which are returned under warranty for complaints of noisy operation have been found to be

2010 BMW 335Cic Convertible (E93) L6-3.0L Turbo (N54) 330

non-defective.

PROCEDURE

[NEW] This procedure only applies to compressor noise diagnosis that does not require a DIAGCODE as per SI B01 01 10. For these vehicles,

complete the mechanical diagnosis test plan in ISTA (Integrated Service Technical Application). This test plan can be found by performing a text

search using the search term "M6450", or by selecting the following path: "Function structure / Body / Heating and Air Conditioning systems" and

"Start search".

In order to assist with the diagnosis of noisy compressors, a "Check Sheet" has been developed to assist the workshop with gathering information

from the customer to ensure proper diagnosis the first time. Please return this "Check Sheet" with any replaced compressor.

Check to see whether a relevant fault symptom is available, using fault symptom diagnosis. Refer to SI B64 04 07 for more information on how to

access fault symptom troubleshooting.

If no fault symptom is available, please use the attached "Compressor Noise Diagnosis" chart when diagnosing any air conditioning compressor

noises.

WARRANTY INFORMATION

For information only

ATTACHMENTS

2010 BMW 335Cic Convertible (E93) L6-3.0L Turbo (N54) 331

view PDF attachment B642105Customer_Checksheet.

view PDF attachment B642105Diagnosis_Flowchart.