Technical Service Bulletin
19 Engine: cooling system - engine overheats, red coolant temperature warning lights up - 4.0 ltr. V8 TFSI
19 24 61 2074303/1 June 27, 2024.
Model(s)

Year

A8

2019 - 2021

S8, SQ7, and
SQ8

2020 - 2024

RS Q8

2020 - 2023

RS 6 Avant, and
RS 7

2021 - 2024

VIN Range

Vehicle-Specific Equipment

All

Not Applicable

Condition
Customer statement:
The engine is overheating.
The coolant temperature gauge is in the red.
The red coolant temperature warning light appears in the instrument cluster.
Workshop findings:
The customer complaint can be reproduced, and the engine temperature is in the red.

Technical Background
EA825 V8 TFSI engines across all power classes are currently equipped with a switchable mechanical coolant
pump.
It is activated via the electric changeover valve N649.
When N649 is activated, it switches a vacuum to the mechanical coolant pump. This pushes a locking sleeve over
the pump impeller, which can cause coolant to stagnate.
When N649 is not activated, no vacuum is switched to the mechanical coolant pump, and the coolant pump is not
covered. In this case, the coolant is pumped through the coolant pump impeller.
SSP 676 contains more information on the EA825 V8 TFSI engine cooling system.

Production Solution
Not applicable.

© 2024 Audi of America, Inc.
Internal

Page 1 of 5

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
Service
Please remove the vacuum hose on the mechanical coolant pump (number 13 in image 1).
Please check whether this results in lower engine coolant temperatures.
If the coolant temperature drops, replace the electric changeover valve for the switchable mechanical coolant
pump N649 according to the Workshop Manual.
Also check whether there are traces of coolant in the vacuum hose between the mechanical coolant pump and
N649, or in the vacuum connection of N649. If there are traces of coolant, please also replace the switchable
mechanical coolant pump according to the Workshop Manual and provide images.

When billing, a video that clearly documents the complaint should be uploaded to DOC-IT.
• To ensure a reference to the vehicle, the video must include the VIN number and the date.
• Please ensure that the video documentation does not show any persons and/or faces, license plates,
or customer data.

© 2024 Audi of America, Inc.
Internal

Page 2 of 5

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

Figure 1. Assembly overview – coolant pump/thermostat incl. switchable mechanical coolant pump, number 12.

© 2024 Audi of America, Inc.
Internal

Page 3 of 5

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

Figure 2. Assembly overview – vacuum system incl. N649, number 9.

Warranty
Claim Type:

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

© 2024 Audi of America, Inc.
Internal

Page 4 of 5

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
Service Number:

1366

Damage Code:

0010

Labor Operations:

Remove and install valve N649

1985 19xx

See SRT with
associated
operations

Remove and install coolant pump (if
necessary)

1950 19xx

See SRT with
associated
operations

GFF

0150 0060

10 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 2074303/1

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.

Additional Information
All part and service references provided in this TSB (2074303) are subject to change and/or removal. Always
check with your Parts Department and/or ETKA for the latest information and parts bulletins. Please check the
Repair Manual for fasteners, bolts, nuts, and screws that require replacement during the repair.
©2024 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.

© 2024 Audi of America, Inc.
Internal

Page 5 of 5

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.