NHTSA ID Number: 11031421
Manufacturer Communication Number: LI83.20-P-076623
TSB/Document Date: 2026-04-22
Summary
Complaint • Insufficient heating output in vehicle interior • Customer describes a one-off, loud "plopping" noise during the journey Workshop findings: • Refrigerant line between refrigerant compressor and condenser is cracked • If listed line is cracked, please conduct the following tests 1. Are the fault codes B19A200 or P053400 current or stored in air conditioner control unit N10*1? 2. Check dryer cartridge at condenser for particles: Remove dryer cartridge, illuminate inlet of dryer cartridge using flashlight (A), and examine filter screen through outlet of dryer cartridge (B) -> see comparison picture bad/good Cause The refrigerant line between the A/C compressor and capacitor may be damaged due to a high refrigerant temperature. Remedy If the tests listed have been carried out and the results correspond to the described fault profile, please carry out the following steps: If the tests listed have been carried out and the results correspond to the described fault profile, please carry out the following steps: 1. Flushing of the refrigerant circuit as per AR83.30-P-1785EQA 2. Then replace the following parts: • A/C compressor (***IMPORTANT: If the A/C compressor A0008304404 or A0008307704 is installed in the vehicle, it must be replaced by part number A0008307804***) • If the capacitor A0998301100 is installed, then replace the complete capacitor (including dryer cartridge and PT sensor). • If capacitor A0998301400/1500 is installed, only new dryer cartridge (A2938350500) • Refrigerant line between refrigerant compressor and capacitor (A2438308600) 3. To use the new refrigerant line A2438308600, the electric line for pressure sensor B161/2 must be extended using the adapter wiring harness A2435408724. • Disconnect plug from pT sensor • Route the adapter line A2435408724 to the newly positioned pT sensor and secure it with a cable tie to prevent chafing 4. Insert the blind plug from the adapter wiring harness onto the old sensor. 5. Check SAM (N10) for latest software. If necessary, perform software update. 6. Finally, please check whether all heating and cooling functions are working; if not, please create a TIPS case with the following information: • Detailed description of the customer complaint and the workshop measures carried out • Initial quick test • Photos of the filter screen of the dryer cartridge
Insufficient Heating Output Due To Broken Refrigerant Line Between Refrigerant Compressor And The condenser (Hot Gas Line)
Topic number
LI83.20-P-076623
Version
4
Function group
83.20 - Heating
Date
4/20/26
Validity
EQA (H243), EQB (X243)
Reason for change
Remedy
Complaint
• Insufficient heating output in vehicle interior
• Customer describes a one-off, loud "plopping" noise during the journey
Workshop findings:
• Refrigerant line between refrigerant compressor and condenser is cracked
• If listed line is cracked, please conduct the following tests
1. Are the fault codes B19A200 or P053400 current or stored in air conditioner control unit N10*1?
2. Check dryer cartridge at condenser for particles: Remove dryer cartridge, illuminate inlet of dryer cartridge using
flashlight (A), and examine filter screen through outlet of dryer cartridge (B) -> see comparison picture bad/good
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© Copyright Mercedes-Benz AG
SAHARRY
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I
Further possible signs for this fault profile are:
• Refrigerant level clearly too low (target: 670 g): In this case, please first of all check where a leak is present in the
system
• Loud noises from compressor: If loud noises are coming from the compressor, this finding must be validated with the
two tests specified above (check the dryer cartridges or the specified fault codes). Loud noises alone are no reason to
replace the compressor, since these can be very subjectively perceived in individual cases.
Attachments
File
Description
checking_filter_of_dryer_cartidge pictogramm.jpg
Fault codes in the climate control unit.jpg
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Redocumentaion VeDoc.jpg
Fehlercode im Klimasteuergerät.jpg
Cause
The refrigerant line between the A/C compressor and capacitor may be damaged due to a high refrigerant temperature.
Remedy
If the tests listed have been carried out and the results correspond to the described fault profile, please carry out the
following steps:
If the tests listed have been carried out and the results correspond to the described fault profile, please carry out the
following steps:
1. Flushing of the refrigerant circuit as per AR83.30-P-1785EQA
2. Then replace the following parts:
•
•
•
A/C compressor (***IMPORTANT: If the A/C compressor A0008304404 or A0008307704 is installed in the vehicle, it must be replaced by part number A0008307804***)
If the capacitor A0998301100 is installed, then replace the complete capacitor (including dryer cartridge and PT
sensor).
If capacitor A0998301400/1500 is installed, only new dryer cartridge (A2938350500)
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SAHARRY
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•
Refrigerant line between refrigerant compressor and capacitor (A2438308600)
3. To use the new refrigerant line A2438308600, the electric line for pressure sensor B161/2 must be extended using
the adapter wiring harness A2435408724.
•
•
Disconnect plug from pT sensor
Route the adapter line A2435408724 to the newly positioned pT sensor and secure it with a cable tie to prevent
chafing
4. Insert the blind plug from the adapter wiring harness onto the old sensor.
5. Check SAM (N10) for latest software. If necessary, perform software update.
6. Finally, please check whether all heating and cooling functions are working; if not, please create a TIPS case with
the following
information:
•
•
•
Detailed description of the customer complaint and the workshop measures carried out
Initial quick test
Photos of the filter screen of the dryer cartridge
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Attachments
File
Description
Redocumentaion VeDoc.jpg
BR243_Spülanweisung_deutsch.pdf
BR243_Flushing_instruction_englisch.pdf
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 > Heater > Insufficient heat output
Body > Air conditioning > Air conditioning > Insufficient cooling output
Parts
Part number
ES1 ES2 Designation
Quantity Note
A0008307804
refrigerant compressor
1
A0998301400/1500
Capacitor
1
A2435408724
Electrical wiring harness sensor
1
A2438308600
Refrigerant line between refrigerant compressor and condenser
1
A2938350500
Filter Dryer
1
EPC
Important: A0008307804 replaces
A0008304404 and A0008307704
X
X
Includes line, blind plug, and cable tie
X
X
only if capacitor A0998301400/1500
is installed
X
Control unit/fault code
Control unit
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© Copyright Mercedes-Benz AG
Fault text
SAHARRY
Page 5 / 6
N10*1 - Signal acquisition and actuation module - Automatic climate control (SAM) (HVAC177)
B19A200 - The electric refrigerant compressor has overtemperature. _
P053400 - The refrigerant level is too low. _
Operation numbers/damage codes
Op. no.
Operation text
Time
Damage
code
Note
8307Y
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TSB/Document ID: LI83.20-P-076623
Replacement Service Bulletin Number:
MFR Communication Date: 2026-04-20
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: VISIBILITY/WIPER
MFR Component System:
MFR Component Subsystem:
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