Technical product information
Topic

AC System not Cooling - HVAC Leakage

Market area

Bentley: worldwide (2WBE),China 796 VW Import Comp. Ltd (Vico), Beijing (6796)

Brand

Bentley

Transaction No. 2078190/5
Level

EH

Status

Released for publishing

Release date

March 6 2026

New customer code

Object of complaint

Complaint type Position

air conditioning -> ventilation, air distribution leaks

Vehicle data
Continental GT/GTC 18-26MY
Sales types

Type MY

Brand Designation Engine code Gearbox code Final drive code

3S3* 2018 E

*

*

*

3S3* 2019 E

*

*

*

3S3* 2020 E

*

*

*

3S3* 2021 E

*

*

*

3S3* 2022 E

*

*

*

3S3* 2023 E

*

*

*

3S3* 2024 E

*

*

*

3S4* 2019 E

*

*

*

3S4* 2020 E

*

*

*

3S4* 2021 E

*

*

*

3S4* 2022 E

*

*

*

3S4* 2023 E

*

*

*

3S4* 2024 E

*

*

*

Z23* 2025 E

*

*

*

Z23* 2026 E

*

*

*

Z24* 2025 E

*

*

*

Z24* 2026 E

*

*

*

Flying Spur 20-26MY
Sales types

Type MY

Brand Designation Engine code Gearbox code Final drive code

Z32* 2025 E

*

*

*

Z32* 2026 E

*

*

*

ZG2* 2020 E

*

*

*

ZG2* 2021 E

*

*

*

ZG2* 2022 E

*

*

*

ZG2* 2023 E

*

*

*

ZG2* 2024 E

*

*

*

Bentayga Series 17-26MY
Sales types

Type MY

Brand Designation Engine code Gearbox code Final drive code

4V1* 2017 E

*

*

*

4V1* 2018 E

*

*

*

4V1* 2019 E

*

*

*

4V1* 2020 E

*

*

*

4V1* 2021 E

*

*

*

4V1* 2022 E

*

*

*

4V1* 2023 E

*

*

*

4V1* 2024 E

*

*

*

4V1* 2025 E

*

*

*

4V1* 2026 E

*

*

*

ZV1* 2023 E

*

*

*

ZV1* 2024 E

*

*

*

ZV1* 2025 E

*

*

*

Documents
Document name
master.xml
hvac_leakage_guidelines.pdf

Technical product information

Transaction No.: 2078190/5

AC System not Cooling - HVAC Leakage

Customer statement / workshop findings
Customer Statement
The customer may find that the A/C system not blowing cold air and / or Cooling performance has declined
over time.
Workshop findings:
The following conditions may be present in workshop findings based on customer complaint:
•

No refrigerant recovered during system evacuation.

•

Leak detected in the rear A/C unit using electronic sniffer tool.

•

Visible refrigerant leak at the evaporator core.

•

Leaks at pipe connections, expansion valve, Schrader valves or drain hose.

•

DTC’s relating to low refrigerant (example – B10ABF0).

Technical background
The evaporator may develop leaks due to corrosion or component fatigue. However it is essential to inspect
all connections before confirming evaporator failure. This TPI also acts as a Guide for diagnosis for AC
Evaporator leakage complaints.
Replace the Evaporator only after leak testing with standard diagnosis methods as per workshop manual
and leakage diagnosis flowchart referenced in the measure section.

Revision History
2078190/5 – Addition guidelines for HVAC leakage diagnosis
If nitrogen or other inert gas test kit is not available, alternative leak detection methods must be used to
identify cause of leak and that the system is leak free before re-charging.

Production change
Improved parts are implemented in Series Production.

Measure

Before conducting any work on the HVAC system, the operative MUST refer to the following within Rep.Gr 87
•

Refrigeration system - Safety and general information

•

Refrigerant oil - Special instructions

•

Refrigeration system - To discharge and charge

IMPORTANT TIP: When a HVAC line/connection has been opened the operative MUST always cap/bung
the applicable port using a suitable cap/bung

If there is a loss of =>150g of refrigerant in the system, then the system should be drained and sniff test
conducted using a suitable inert gas (dry nitrogen). If nitrogen or other inert gas test kit is not available,
alternative leak detection methods must be used to identify cause of leak and that the system is leak free
before re-charging.

CAUTION
Refrigerant must never be discharged to atmosphere, and leak testing must not be performed using
refrigerant gas; instead, use dry nitrogen for pressurization and confirm nitrogen sniff test compatibility
with standard dealer equipment. If nitrogen or other inert gas test kit is not available, alternative leak
detection methods must be used to identify cause of leak and that the system is leak free before recharging.

Refer to the attached and figure 1 below for process flow for confirmation of leakage from the HVAC system.

Figure 1

1. Confirm the leakage source by performing an HVAC sniffer test around the evaporator, accessible
refrigerant lines, and fittings; additionally, conduct a soap solution test.
•

Attach a video of any leak findings to the DISS report.

2. Check TXV connections, EXV, pipe lines & chiller using sniff test:
•

If detected confirm with soap solution and attach video to DISS query.

3. Inspect both Schrader valves with caps fitted & then again with protective caps removed for leaks with
refrigerant leak detector (sniff test).
•

If a leak is indicated, verify with a soap solution test and record a video for upload attach video to DISS
query.

4. Isolate HVAC from rest of system by disconnecting at TXV valve / EXV pipe lines

•

Using nitrogen test kit (recommended), perform a pressure test on the rest of the (under bonnet)
system and confirm okay before proceeding to evaporator investigation. If nitrogen test kit is not
available use alternative leak detection methods to confirm this section of the system is leak-free
before proceeding to evaporator inspection. Provide evidence of pressure test / leak test results
confirming leak free.

5. Only proceed to step 6 once steps 1-4 have been completed and reported.

6. If an evaporator leak is suspected:
NOTICE
Raise a full Technical DISS query before removing the evaporator and wait for approval before proceeding.

•

Once approval is received, remove the evaporator and housing assembly in accordance with ElsaPro
Rep. Gr 87.

•

Confirm evaporator leakage by performing an underwater leak test using compressed air applied to the
evaporator. Attach a video of the test confirming the leakage to the DISS query.

NOTICE
Important: If the evaporator undergoes a water (underwater) leak test, it must be replaced, even if no leak
is detected. If a leak is found, a video showing the leak must be included in the DISS query.

•

Renew all seals and O-rings.

•

Perform a vacuum test and recharge the system.

•

Verify A/C performance.

Warranty accounting instructions

In the event that any parts are required to be replaced please refer to the warranty accounting instructions
with Elsa pro this is due to the numerous vehicle specification and symptom scenarios.
Warranty Type: 110 or 910
Damage Service Number: 87 60 – Evaporator
Damage Code: 00 50
Labour
Air conditioning Check
Labour operation code: 87 01 01 20
Time: 50 TU

Refrigerant drained and Filled
Labour operation code: 87 03 17 00
Time: 60 TU (Bentayga)
Time: 50 TU (Continental GT/GTC/Flying Spur)

NOTICE
All HVAC related claims will be checked by the Warranty team, any claims which are not deemed as
applicable will be cancelled. In the event that parts are replaced parts without the required attachments or
the parts are found to be not at fault warranty claims will be liable for rejection.

Parts information
Part Name

Part Number

Evaporator (with housing) 971260122A

Always refer to ETKA Parts Catalogue