87 Faint noise heard in cabin from air conditioning circuit
87 18 85 2044717/7 February 13, 2018. Supersedes Technical Service Bulletin Group 87 number 17-84 dated
December 12, 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

7

-

Revised Warranty (Change to warranty table labor operation order)

6

12/12/2017

Revised Service (Added bolts for balance weight)
Revised Required Parts and Tools (Added bolts for balance weight)

5

09/20/2017

Revised Warranty (Added 2.0 TFSI 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 8
© 2018 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 8
© 2018 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.

Figure 3. Mounting bolt centering sleeves
on the air conditioning compressor housing.
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 compressor failure (as well as possible engine
and/or 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 8
© 2018 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) with 2
bolts (part number N 10653601) 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 8
© 2018 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:

For All Models:
Refrigerant drain + fill (if necessary)

8703 1700

60 TU

Air conditioner clean

8701 2950

110 TU

Compressor remove + reinstall

8734 1913

70 TU

Charge air cooler remove and reinstall

2143 1913

90 TU

Receiver-drier insert remove + reinstall

8755 5500

40 TU

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

8734 1941

160 TU

Additional radiator front remove and reinstall

1980 1941

90 TU

Charge air compressor remove and reinstall

2114 1941

160 TU

Charge air coolers remove and reinstall

2143 2091

190 TU

Receiver-drier insert remove + reinstall

8755 5550

10 TU

Crossmember remove + reinstall

5034 1900

90 TU

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

8770 1950

30 TU

GFF

No allowance

0 TU

Road test prior to service procedure

0121 0002

10 TU

For A6 with 2.0 Liter Engine:

-orFor A6 or A7 with 3.0 Liter Engine:

Diagnostic Time:

Page 5 of 8
© 2018 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.

Road test after service procedure
Claim Comment:

0121 0004

10 TU

As per TSB #2044717/7

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 8
© 2018 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
N 10653601

2

Bolt
G 052300A2

0.5

PAG oil for Denso Refrigerant Compressors

Page 7 of 8
© 2018 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.

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. Please check the Repair
Manual for fasteners, bolts, nuts, and screws that require replacement during the repair.
©2018 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 8 of 8
© 2018 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.