3 Coolant circuit with auxiliary/supple‐
mentary heater
⇒ “3.1 Connection diagram – coolant hoses”, page 24
⇒ “3.2 Removing and installing heater coolant shut-off valve N279
”, page 25
3.1 Connection diagram – coolant hoses
Note
The -arrows- indicate the direction of coolant flow.
1 - Heat exchanger for heater
in heater and air conditioning
unit
❑ Incorporation in coolant
circuit ⇒ Rep. gr. 19 ;
Cooling system, cool‐
ant; Schematic diagram
- coolant hoses
2 - Auxiliary/supplementary
heater
❑ Removing and installing
⇒ page 14
3 - Circulation pump - V55-
❑ The circulation pump -
V55- is integrated in the
hose assembly of the
auxiliary/supplementary
heater.
❑ Removing and installing
⇒ page 16
Note
♦
For this vehicle, a start/stop sys‐
tem is offered as an optional
equipment with certain engines.
♦
On vehicles equipped with a
start/stop system, the circulation
pump - V55- of the auxiliary/sup‐
plementary heater can be actu‐
ated by the auxiliary heater con‐
trol unit - J364- while the stop
function is active. To achieve
this, the auxiliary heater control
unit - J364- is sent a command
via the data bus from the air con‐
ditioning system operating unit,
the Climatronic control unit -
J255- and the air conditioning
system control unit - J301- to
switch on the circulation pump -
V55- (⇒ Vehicle diagnostic tester
in “Guided Fault Finding” mode).
Transporter 2020 ➤
Auxiliary heater - Edition 04.2020
24 Rep. gr.82 - Supplementary heating
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