LI20.20-P-071612

Coolant warning in instrument cluster Leak in coolant line below air filter
Topic number
LI20.20-P-071612
Version
1
Function group
20.20 Radiator, coolant hoses
Date
08-12-2020
Validity
All with M139
Reason for change
Reason for block
Complaint:
Coolant warning in the instrument cluster
Fault code P021700 - Coolant temperature of combustion engine too high - may be present
System pressure loss test (see WIS) reveals external coolant loss
Attachments
File
Description
20200124_095501.jpg
Example of leak location
Cause:
Coolant line below air filter (A1775012702) may leak, see example image
Remedy:
Before replacing the line, it is essential to create a PTSS case, with images showing location of leak
Symptoms
Overall vehicle / Complete vehicle / Overheating
Power generation / Engine cooling system / Indicator lamp / Illuminates yellow
Power generation / Engine cooling system / Function / Coolant level too low
Power generation / Engine cooling system / Display message / Coolant - Serviced Required
Control unit/fault code
Control unit
Fault code
N3/10 - Motor electronics 'MR- P021700
G1AMGR4' for combustion engine 'M139' (ME) (A (177),CLA
(118))
08-12-2020 3:37 PM
© Copyright Mercedes-Benz AG
Fault text
The coolant temperature of the engine is too high. _
CBUTCHE
Page 1/4
N10 - Signal acquisition and
P25567B
actuation module (SAM)
(BCMFA2) (A (177),CLA (118))
Sensor 'Coolant level' has a malfunction. The fluid level is too
low.
WIS-References
Document number
Title
Note
AR20.00-P-1010MFG
Inspect cooling system for
leaks
Allocation
Complaint
Validity
Vehicle
Engine
Transmission
*
139
*
Attachments
08-12-2020 3:37 PM
© Copyright Mercedes-Benz AG
CBUTCHE
Page 2/4
20200124_095501.jpg:
08-12-2020 3:37 PM
© Copyright Mercedes-Benz AG
CBUTCHE
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08-12-2020 3:37 PM
© Copyright Mercedes-Benz AG
CBUTCHE
Page 4/4