167 Air Conditioning System Leak
Topic number

LI83.30-P-077763

Version

18

Function group

83.30 - Air conditioning

Date

5/12/25

Validity

167

Reason for change

Remedy

Complaint
Customer concern of Air Conditioning not cooling.

Cause
Possible refrigerant leak at the evaporator.

Remedy
Perform the following measures :
Remedy 1 (Only applies to vehicles produced during or prior to June 2023)

1.
2.
3.

Picture of the forming gas check being performed with RO that shows the VIN clearly in view.
Clear picture of VIN on B-pillar.
Ensure that the rest of the AC system has been thoroughly checked for leaks before condemning the evaporator.

Remedy 2 (Applies to all 167's produced after June 2023)

1.
2.
3.
4.
5.
6.
7.
8.

Ensure that the rest of the AC system has been thoroughly checked for leaks before condemning the evaporator.
Do NOT remove the expansion valve from the evaporator prior to being advised to in a TIPS case.
Initial Quick Test
Create a short video of the actual pressures via AC machine, showing the engine running, and hold a copy of
the VIN/RO in view as well.
Picture of the forming gas check being performed with RO that shows the VIN clearly in view.
OBS recording of XENTRY AC actual values of compressor request to be on and current value. (Instructions in
Attachments)
Video recording of the leak being found via sniffer at the R/F AC drain after removing the under dash panel. (see
attached videos)
If the evaporator is found to be leaking via sniffer, another video needs to be uploaded (or a continuation if only
making the video after checks), showing the expansion valve being checked for leaks.

14.05.2025 16:23
© Copyright Mercedes-Benz AG

CCUSHWA

Page 1 / 3

9.
10.

If no leaks are found with the sniffer at the expansion valve, spray soapy water mix on the expansion valve and
check for leaks. Upload a video showing the spray test and VIN.
Open a TIPS case in the HV/LV inbox labeled "167 Evaporator Suspected of Leaking" with all attachments.

NOTE: (Applies to all 167's)
•
•
•
•

Please see the list of WIS documents for forming gas leak check and recharging of the system.
All documents, with the exception of videos need to be uploaded for the warranty claim. Videos are only needed
if a TIPS case is opened.
Ensure that a full vacuum is pulled on the system for at least 30 minutes after replacement
Condenser replacement is NOT authorized as a suitable repair in lieu of the dryer not being available.

Attachments
File

Description

Expansion valve leak.mkv
Leak at drain hose.mkv
Using OBS Studio For Xentry Kits.pptx

WIS-References
Document number

Title

Note

AR83.30-P-1760ME

Drain, evacuate and recharge air con- Performing drain and refill
ditioning, check for proper operation
and check for leaks

AR83.30-P-1761ME

Check air conditioning system for lea- Must be done for all leak checks
kage

AR83.30-P-1785ME

Flush air conditioning

Only to be performed if debris is found
in the system

SI83.30-P-0021A

Service Information: Damage code

Notes for damage code to be used.

Disclaimer
NOTE: The information contained in this document is intended for use by trained, professional technicians with the
knowledge to properly and safely perform diagnosis and repairs on Mercedes-Benz vehicles, using Mercedes-Benz
approved tools and equipment. It informs service technicians about conditions that could occur in certain vehicles and
provides information that could assist in proper vehicle diagnosis, service, or repair. It does not indicate that a defect
is present in any vehicle referenced in this document nor does it imply warranty coverage. DO NOT assume that a
symptom or condition, or a described cause of a symptom or condition, affects any particular vehicle or groups of vehicles, or that a described repair applies to any particular vehicle or groups of vehicles. There can be multiple causes
resulting in the same or similar symptoms or conditions described in this document, and trained professional service
technicians must use their diagnostic skills to make evaluations on a case-by-case basis. The information contained
in this document does not guarantee warranty coverage nor does it extend the vehicle’s warranty in any way.

Symptoms
Body > Air conditioning > Air conditioning > Insufficient cooling output

Operation numbers/damage codes
Op. no.

Operation text

14.05.2025 16:23
© Copyright Mercedes-Benz AG

Time

CCUSHWA

Damage
code

Note

Page 2 / 3

Damage Code

8343204

Submit all claims under this damage
code

540650

Battery Maintainer

541011

Quick Test

826455

Extra work for left wiper

(only with code 874)

826456

Extra for right wiper

(only with code 874)

826890

Check wiper angle

(only if required)

831232

Video and pictures as required in Li

Up to 0.7hr allowable time.

831762

AC drain/fill/check

832975

R&R cowl

14.05.2025 16:23
© Copyright Mercedes-Benz AG

CCUSHWA

Page 3 / 3