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Technical Service Bulletin

19 Mechanical coolant pump - loss of coolant - 2.9L, 3.0L V6 TFSI

Transaction No.: 2070349/5
Release date: Dec 1, 2025

Condition
Model(s) Year(s) VIN Range Vehicle Specific Equipment
A4, A5, S5 Cabriolet, S5
Sportback, RS 5, and 2018 — 2024
$Q5
A6, A7, A8, and Q8 2019 — 2024
RS 5 Sportback 2019
pomac 2021 — 2024 All 2.9L, 3.0L V6 TFSI
AG allroad, S6,S7, and | 5999 _ 2904
Q7
A8 e quattro 2020 — 2021
SQ5 Sportback 2021 — 2024
REVISION HISTORY
Revision | Date Purpose
5 - Revised Condition (Added model table)
Revised Service (updated instructions)
Revised Warranty (Adjusted warranty table)
4 08/30/2024 | Revised Service (updated instructions)
Revised Technical Background (Added figure 2)
3 12/12/2023 | Revised Service (updated instructions)
Customer states:

¢ Coolant loss/leak.

* Coolant warning lamp.

* Engine warning lamp on.

Workshop findings:

The coolant pump is found to be the source of the leak.

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DTC “P0299: Turbo/Super Charger Underboost” may be logged when changeover valve N649 is impaired
by coolant entering. This can result in functional restrictions in the vacuum system.

Documentation is required.

Technical Background

To avoid repeat repairs or incorrect repairs, make sure to locate the leak precisely. Ensure that the coolant level has
not dropped due to insufficient bleeding due to a previous repair.

Note:
1) Traces of coolant (small quantity) on drip cup (refer to Figure 1).

Due to lubrication/cooling of the seal, up to 3 ml may escape over the course of 100 hours of operation. This is quite
normal and does not constitute a reason for a complaint.

Figure 1: Traces of coolant on the drip cup.

2) Dried deposits on vacuum connection are not a clear indication of a leak (see Figure 2).

Figure 2: Dried deposits on vacuum connection.

Production Solution
Not applicable.

Service

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Try to reproduce the customer complaint (based on the description/cause of the issue), so that it can be
clearly assigned to this TSB. The following repair must only be carried out if all the criteria (model/type,
chassis number, engine/motor, gearbox code, PR number(s), part number, software version, code, etc.)
apply exactly. Otherwise, this solution will not eliminate the problem and repeat repairs may be
necessary. In such a case, the warranty claim may be rejected, and the cost of the parts may be charged
back.

1.Prufpunkt / Checkpoint

3.Prafpunkt/ Checkpoint

2.Prifpunkt / Checkpoint

Figure 3: Vacuum system checkpoints.

Please assess the leak using the following steps:

1.

Check the vacuum line and valve N649 (Checkpoint 1, Figure 3) for traces of coolant. Disconnect them to do
so.

a. If traces of coolant are visible, replace the mechanical coolant pump and follow steps 6b and 7.
b. No traces of coolant are visible, follow step 2.

Clean and dry the leak and traces of coolant thoroughly.
Fill the cooling system to max.

Perform a visual check; assess whether there may be a leak at idling speeds and at higher engine speeds of
approx. 2500 rpm.

Check the cooling system for leaks according to the workshop manual, see ELSA.

Reassess the suspected leak.

a. If no coolant leak could be detected during the test, it is recommended to further observe the vehicle. It is
not necessary to replace any parts.

b. If a coolant leak can be detected: replace the component causing the damage and document leaks with
photo/video. If the coolant pump is evidently leaking, also photograph the production date as shown in Figure
4.
7. Checking the vacuum system:

a. The leak in the coolant pump could contaminate other components of the vacuum system with coolant.
Check systematically and document inspection of checkpoints 2 and 3 (Figure 3) for coolant residue. If
fresh coolant is found, replace the contaminated components, (for example, as labeled in figure 3: the
entire vacuum line, item 1: N545, item 11: coolant shut-off valve, item 6: vacuum reservoir, etc.) Note:
please view attachment ea839_vacuum_system.pdf for precise overview of the different vacuum

systems.

Checkpoint 1: Vacuum line connection from N649
Checkpoint 2: Connection to vacuum line N645 / Coolant shut-off valve
Checkpoint 3: Vacuum distributor in area of vacuum pump.

b. If no coolant residue is visible in checkpoints 2 to 3, replace valve N649 and clean only the vacuum line
between the coolant pump and valve N649 using compressed air.

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Figure 4: Example of coolant pump production date.
Warranty
Claim Type: * — If the vehicle is outside of any warranty, this Technical Service Bulletin is
informational only.
Service Number: 1950
Damage Code: 0050
Labor Operations: Remove and install noise insulation. (Use only if |1082 19XX See SRT with
nothing is replaced) associated operations
Check and top up coolant, clean, and perform 1938 3599 30 TU
visual check.
Check cooling system for leaks 1901 0150 See SRT with
associated operations
Remove and install coolant pump (Only if faulty) 1950 19XX See SRT with
associated operations

Remove and install regulating valve N649 (Only if | 1985 1999 10 TU

faulty)

Remove and install regulating valve N545 and 1985 2099 30 TU

shut-off valve (Also, if faulty)

Vacuum pump (Also, if faulty) 4776 1999 20 TU

Vacuum reservoir, A6/A7 3.0L (Also, if faulty) 2163 1999 190 TU

Remove and install vacuum reservoir installed 2163 1999 360 TU

below engine support, A6/A7 2.9L with manual air

condition compressor (Also, if faulty)

Remove and install vacuum reservoir installed in |2163 1999 20 TU

wheel housing, AG/A7 2.9L with electric air

condition compressor (Also, if faulty)

Vacuum reservoir, A4/A5 3.0L (Also, if faulty) 2163 1999 180 TU

Remove and install vacuum reservoir installed 2163 1999 220 TU

below engine support, A4/A5 2.9L (Also, if faulty)

Vacuum reservoir, Q5 (Also, if faulty) 2163 1999 180 TU

Vacuum reservoir, A8 (Also, if faulty) 2163 1999 190 TU

Vacuum reservoir, A8 PHEV (Also, if faulty) 2163 1999 420 TU

Extract refrigerant and fill circuit, A8 PHEV 8703 17xx See SRT with

(Additionally, if required) associated operations

Vacuum reservoir, Q7/Q8 (Also, if faulty) 2163 1999 120 TU

GFF 0150 0000 Labor according to the
diagnostic log

Charge battery 2706 8950 See SRT with
associated operations

Claim Comment: As per TSB 2070349/5

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.

Additional Information

All part and service references provided in this TSB (2070349) 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.

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