2.
Open drain plug at coolant inlet (arrow) and
drain coolant.
3.
Undo clamps on both lines on preheater side.
Checking heating element and
housing for contamination
1.
Undo screws (1) between electrical part (2)
and housing.
2.
Pull electrical part (2) with heating element
out of housing.
3.
Check inside of housing for dirt. Clean with a
wire brush and/or moist rag as necessary.
4.
Check heating element for contamination.
Clean with a wire brush as necessary.
5.
Fit new O-ring ensuring it is correctly posi-
tioned.
6.
Insert cleaned or new heating element into
housing.
7.
Install electrical part (2) and tighten
screws (1).
Installing coolant lines
1.
Clean drain plug and screw-in thread (arrow)
at preheater.
2.
Coat drain plug with screw locking compound
Loctite 586 and screw in.
3.
Connect coolant return and supply lines to
preheater and tighten clamps.
4.
Vent coolant preheating circuit:
a) Open return line valve.
b) Undo the clamp of the coolant supply
line near the valve.
c) Wait until coolant has reached the end of
the coolant supply line.
d) Tighten the clamp of the coolant supply
line.
5.
Fill in engine coolant until the required level
is reached (→ Page 164).
MS15058/04E 2018-12
| Coolant Circuit, General, High-Temperature Circuit | 175
TIM-ID: 0000081913 - 004
Summary of Contents for 20V4000G44F
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