P20.00-0387-09
Diagram of coolant circuit with additional heater
1 Coolant expansion reservoir cap (single-stage)
2 Coolant expansion reservoir
3 Radiator
4 Filling ventilation (only operates when cap removed)
5 Coolant thermostat (position engine cold)
6 Crankcase
7 Coolant pump
8 Oil-water heat exchanger
9 Electric heating water pump
10 Heater booster
11 Bleeder screw
12 Heating system heat exchanger
A Coolant return flow
B Coolant feed
C Bypass mode temperature < 87° C
coolant flow only through engine and passenger compartment heating
D Mixed mode temperature >87° C<102° C
thermostat opens. Start of flow through radiator
E Cooling mode temperature >102° C
thermostat opened, full flow through radiator
L Air flow
M Engine