Technical Service Bulletin
19 Coolant leak in area of coolant thermostat housing/coolant pump - 2.0TFSI
19 21 15 2061604/3 April 1, 2021. Supersedes Technical Service Bulletin Group 19 number 21-14 dated March 8,
2021 for reasons listed below.
Model(s)

Year

VIN Range

Vehicle-Specific Equipment

A3

2007 - 2013

All

Evo2

A4

2007 - 2016

All

Evo2

A5

2010 - 2016

All

Evo2

A6

2012 -2015

All

Evo2

A8

2013

All

Evo2

Q3

2012 - 2018

All

Evo2

Q5

2011 - 2017

All

Evo2

TT

2009 - 2014

All

Evo2

Condition
REVISION HISTORY
Revision

Date

Purpose

3

-

Revised Warranty (Updated Labor Operation)

2

03/08/2021

Revised Warranty (Updated Labor Operation and condensed table)

1

12/14/2020

Initial publication

Customer state:
• The coolant temperature warning light is on.
• There are clear coolant marks under the front end/engine compartment.
Workshop findings:
• The leak can be reproduced.
• The cause for the coolant loss is found around the coolant thermostat housing or the coolant pump.

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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.

Technical Service Bulletin
Technical Background
Coolant loss from the
coolant thermostat housing
(Figure 1, position 1) or the
coolant pump (Figure 1,
position 2).

Figure 1. Coolant thermostat/coolant pump. Parts are available separately, see
parts table below.

Production Solution
Not applicable.

Service
Note:
Refer to Warranty Policy and Procedures section 3.21.9 (Only category 3 leaks in the table
Categorization of leaks can be claimed under warranty).
Check the cooling system for leaks according to the repair manual (pressure check).
Only replace the leaking component (coolant pump or coolant thermostat housing).
Proceed as follows:

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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.

Technical Service Bulletin
1) Remove the coolant thermostat housing including the coolant pump according to Elsa at repair
manual: Engine >> 4 - Cylinder Direct Injection >> 19 Cooling System >> Coolant Pump/Coolant
Thermostat >> Coolant Pump, Removing and Installing.
2) Separate the water pump and coolant thermostat housing by removing the five connecting bolts
(Figures 1 - 2).
3) Replacing the leaking component (coolant thermostat housing or coolant pump) with a replacement
part, proceed as follows:
• Assemble the coolant thermostat
housing and the coolant pump and
attach the five connecting bolts.
• Align the two components against
one another in such a way that
both components are flush to one
another in the areas marked in red
(Figure 2). The thermostat housing
must not be higher/lower than the
coolant pump (run your finger over
the three areas to check).
• Torque the connecting bolts of the
two components to 10 Nm.

Figure 2. Securing bolts of the coolant pump (1 to 5).
4) Install the assembled coolant module to the engine. Make sure the bolts are only hand-tight at this
point.

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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.

Technical Service Bulletin
5) Check the toothed belt tension (Figure
3) by pressing the toothed belt
together centrally between the two
toothed belt sprockets. The measured
distance of the backs of the toothed
belt should be between 28mm and
30mm. A measuring caliper can also
be used for toothed belt compression
and measurement.

Figure 3. Checking the toothed belt tension.
The measured distance is between 28mm and 30mm:
6. Complete the installation of the coolant module according to the instructions in ELSA (Step 7 is not
necessary).
The measured distance is smaller than 28mm and greater than 30mm:
7) Adjustment of the toothed belt tension is necessary.
Proceed as follows (Figure 4) for assistance:
• Note down the measured value (e.g. 26mm) from
step 5).
• Remove the cooling module from the engine again,
loosen the coolant pump bolts (Figure 2) and make
adjustments as outlined below.
• If the measured distance of the backs of the
toothed belt (pressed together) is less than 28mm
(e.g. 25mm), then the belt tension is too low. A
slight adjustment away from the balance shaft is
necessary (direction "a").
• If the distance of the backs of the toothed belt
(pressed together) is greater than 28mm (e.g. 32
mm), then the belt tension is too great. A slight
adjustment towards the balance shaft is necessary
(direction "b").

Figure 4. Adjusting the toothed belt tension.

8. Tighten the five securing bolts of the coolant pump and repeat steps 4 and 5.

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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.

Technical Service Bulletin
Warranty
Claim Type:

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

Service Number:

• 1950 (Coolant Pump).
• 1955 (Thermostat Housing).

Damage Code:

0050

Labor Operations:

Remove and install the coolant pump

1950 1913

See SRT with
associated
operations

Remove and install the coolant pump

1950 1937 (A3
Only)

See SRT with
associated
operations

Replace water pump and check/adjust tooth belt
tension

1950 5599

20 TU

Replace thermostat housing and check/adjust tooth
belt tension

1955 1999

20 TU

GFF

No allowance

0 TU

Road test prior to the service procedure

No allowance

0 TU

Road test after the service procedure

No allowance

0 TU

Diagnostic Time:

Claim Comment:

As per TSB #2061604/3

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
Always check with your Parts Department and/or ETKA for the latest information and parts bulletins.
Part Number

Part Description

Quantity

See ETKA

Fasteners, Bolts, Nuts, Screws, and additional gaskets
as needed per the Repair Manual

See ETKA/ELSA

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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.

Technical Service Bulletin
06H121010A

Water Pump (only if leaking)

01

06H121111R

Thermostat Housing (only if leaking)

01

06H121043

Gasket

01

Additional Information
More information on this system can be found in the following resources:
• Warranty Online: Warranty Policy and Procedures section 3.21.9.
• Elsa: Engine >> 4 - Cylinder Direct Injection >> 19 Cooling System >> Coolant Pump/Coolant Thermostat >>
Coolant Pump, Removing and Installing.
All parts and service references provided in this TSB (2061604) are subject to change and/or removal.
©2021 Audi of America, Inc. All rights reserved. The 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.

© 2021 Audi of America, Inc.

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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.