X Series E53 X5 4.4i (M62) OFFRD
VS-21/Seyfried
Baugruppe/Group: 17
17 01 01 (665)
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Datum/Date:
03/2001
Coolant level in expansion tank
E53, E38, E39 / M62, M62 LEV
Complaint:
-
Check control message "Check coolant water level" (permanent display), coolant level
in expansion tank too low
-
Check control message "Check coolant water level" (intermittent display)
-
Coolant traces on expansion tank cap and on expansion tank
Cause:
Experience has shown that in the event of the above complaints, there are no leaks or
component faults on the cooling system, including the coolant level switch.
-
Check control message "Check coolant water level" (permanent display), coolant level
in expansion tank too low:
On new vehicles, or if the coolant has just been replaced, the bleeding process is not
yet complete. Residual air remaining in the cooling system is bled off from the
expansion tank gradually, depending on the driving profile.
Consequently, the coolant level in the expansion tank will drop, in some cases below
the cold fill level.
Note:
The coolant level will naturally drop below the cold fill level more often in the wintertime
(less coolant expansion).
-
Check control message "Check coolant water level" (intermittent display)
The lower the engine temperature/ambient temperature, the lower the coolant level in
the expansion tank.
This can cause the coolant level switch to correctly activate the check control
message "Check coolant level" after a cold start due to the coolant level being
detected as "on the lower limit" in the expansion tank.
As the engine warms up, the coolant will expand and the coolant level in the
expansion tank will rise.
The check control message "Check coolant level" will no longer appear when the
engine is restarted.
This intermittent check control message is often cited as a reason for incorrectly
replacing the coolant level switch, even though it is not faulty.
The angle of the vehicle also has an effect on intermittent check control messages
(especially on X5 off-road vehicles)
-
Coolant traces on expansion tank cap and on expansion tank:
If the cooling system is overfilled, the pressure relief valve in the expansion tank cap
will as a matter of function release pressure.
Affected
vehicles:
E38, E39, E53/M62, M62 LEV
Manufacturing period: throughout series production
Remedy:
Optimisation of charging and bleeding of the cooling system in series production from
February 2001.
Procedure:
SI Coolant level in expansion tank E53 E38 E39 M62, M62 LEV
BMW AG - TIS
07.02.2013 23:29
Issue status (12/2007) Valid only until next DVD is issued
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