87 Faint noise heard in cabin from air conditioning circuit
87 17 82 2044717/5 September 20, 2017. Supersedes Technical Service Bulletin Group 87 number 17-81 dated
August 16, 2017 for reasons listed below.
Model(s)

Year

VIN Range

Vehicle-Specific Equipment

A6, A7

2012 - 2015

All

2.0L or 3.0L gas engine

Condition
REVISION HISTORY
Revision

Date

Purpose

5

-

Revised Warranty (Added 2.0 TFSI labor operation)

4

08/16/2017

Revised Warranty (Corrected labor operation)

3

01/26/2017

Revised Warranty (Removed overlap labor operation)

A faint, high-pitched “whine” or high frequency buzzing noise is heard in the cabin when the air conditioning is set
to “Low” and the fan speed is no higher than 2. The audio system must be off and there should be no other noises
in the cabin, otherwise the noise may not be heard.

Technical Background
This noise can be created due to an anomaly in the acoustic characteristic in the refrigerant circuit under these
specific settings (air conditioning set to “Low” and fan speed no higher than 2). There is no technical fault with the
air conditioning system and no functional issue with the climate control system.

Production Solution
Not applicable. The refrigerant circuit architecture in the A6 and A7 models to which this bulletin applies is no
longer in production.

Page 1 of 7
© 2017 Audi of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and other intellectual property rights of Audi of
America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted
in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the
publisher.

Service
The noise symptom must be readily duplicated before any repair is performed. It is a good idea to ask the
customer to duplicate the noise symptom for the technician to ensure that the repair resolves the customer’s
specific concern.
If the noise cannot be duplicated, do not perform any repair to the vehicle. If the noise can be duplicated
consistently, proceed as follows:
1. Perform a complete recovery and flush of the air
conditioning refrigerant circuit (Figure 1 and Figure 2).

Figure 1. A/C flushing unit.

Figure 2. Flushing fitting set.

Page 2 of 7
© 2017 Audi of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and other intellectual property rights of Audi of
America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted
in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the
publisher.

2. Remove the air conditioning compressor, empty the
compressor of the PAG oil completely, then reinstall it to
the vehicle. The compressor does not need to be replaced.

Note:
It is imperative that the compressor mounting bolt centering
sleeves be reinstalled with the compressor (Figure
3). Failure to reinstall these sleeves will result in
Figure 3. Mounting bolt centering sleeves on
compressor failure (as well as possible engine and/or
the air conditioning compressor housing.
ancillary component damage) in a short period of time. If
any sleeves were misplaced during the removal and
reinstallation process, new sleeves should be ordered and
installed on the compressor housing before
reassembly. Compressor or consequential component
damage resulting from a failure to install the centering
sleeves will not be accepted under warranty.
3. Replace the low side refrigerant line that connects the air
conditioning compressor suction port to the hybrid
refrigerant line to the expansion valve (Figure 4). Be certain
to use new O-rings at these and all refrigerant circuit joints
that are disconnected.

Figure 4. Low side line to be replaced.

Page 3 of 7
© 2017 Audi of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and other intellectual property rights of Audi of
America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted
in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the
publisher.

4. Install the balance weight (part number 4G0513621A) to
the line in the position shown in the illustration (Figure 5).

Figure 5. Balance weight position on low side
line.
5. Recharge the refrigerant circuit with the specified
volume. Replace the PAG oil completely with new PAG oil
at the specified volume. Do not reuse the original oil
extracted during the system flush. Use only the Denso PAG
oil (part number G 052300A2) (Figure 6). Do not use a
substitute.

Figure 6. Denso PAG oil.
6. No additional air conditioning components need to be replaced. Recheck the air conditioning system under
the same settings used to duplicate the noise symptom and confirm that the noise issue is resolved.

Page 4 of 7
© 2017 Audi of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and other intellectual property rights of Audi of
America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted
in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the
publisher.

Warranty
Claim Type:

 110 up to 48 Months/50,000 Miles.
 G10 for CPO covered vehicles – Verify Owner.
 If vehicle is outside any warranty, this Technical Service Bulletin is informational only.

Service Number:

8745

Damage Code:

0020

Labor Operations:

Refrigerant drain + fill (if necessary)

8703 1700

60 TU

Compressor remove + reinstall (for 3.0 liter A6 or A7)

8734 1941

160 TU

Compressor remove + reinstall (for 2.0 liter A6)

8734 1913

70 TU

Charge air cooler remove and reinstall

21 43 19 13

90 TU

Receiver-drier insert remove + reinstall

8755 5500

40 TU

Receiver-drier insert remove + reinstall (A6 with 2.0 TFSI):

-orReceiver-drier insert remove + reinstall (A6 and A7 with 3.0 liter engine):

Diagnostic Time:

Additional radiator front remove and reinstall

19 80 19 41

90 TU

Charge air compressor remove and reinstall

21 14 19 41

160 TU

Charge air coolers remove and reinstall

21 43 20 91

190 TU

Receiver-drier insert remove + reinstall

87 55 55 50

10 TU

Crossmember remove + reinstall

5034 1900

90 TU

Expansion valve remove + reinstall (Includes
compressor/evaporator line remove and reinstall)

8770 1950

30 TU

Air conditioner clean

8701 2950

110 TU

GFF

No allowance

0 TU

Road test prior to service procedure

0121 0002

10 TU

Road test after service procedure

0121 0004

10 TU

Technical diagnosis at dealer’s discretion

Page 5 of 7
© 2017 Audi of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and other intellectual property rights of Audi of
America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted
in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the
publisher.

(Refer to Section 2.2.1.2 and Audi Warranty Online for DADP allowance details)
Claim Comment:

As per TSB #2044717/5

All warranty claims submitted for payment must be in accordance with the Audi Warranty Policies and Procedures
Manual. Claims are subject to review or audit by Audi Warranty.

Required Parts and Tools
Part Number

Part Description

Quantity

ROB134APF

1

Robinair A/C Service Unit
VAS 6338/1

1

Refrigerant Circuits Adapter Set
4G0260707X

Air conditioner hose (Compressor to hybrid line)

1

Use appropriate
part number for the

Page 6 of 7
© 2017 Audi of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and other intellectual property rights of Audi of
America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted
in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the
publisher.

hose according to
the VIN in ETKA
4G0513621A

1

Balance Weight
G 052300A2

0.5

PAG oil for Denso Refrigerant Compressors

Additional Information
All parts and service references provided in this TSB (2044717) are subject to change and/or removal. Always
check with your Parts Department and service manuals for the latest information.
©2017 Audi of America, Inc. All rights reserved. Information contained in this document is based on the latest
information available at the time of printing and is subject to the copyright and other intellectual property rights of
Audi of America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any
time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted in
any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, nor may these
materials be modified or reposted to other sites without the prior expressed written permission of the publisher.

Page 7 of 7
© 2017 Audi of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and other intellectual property rights of Audi of
America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted
in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the
publisher.