Coolant circuit as-built condition

P20.00-0238-06

Diagram of coolant circuit engine 602.982

1 Coolant expansion reservoir with single-stage cap 1.4 bar

1a Silica gel tank

2 Radiator

3 Coolant thermostat

4 Coolant pump

5 Oil filter with oil-water heat exchanger

6 Heating system heat exchanger

7 Vent line to coolant expansion reservoir

A31 Heating system delivery unit

A31y1 Left duovalve

A31y2 Right duovalve

A Coolant return flow

B Coolant feed

D Bypass mode temperature
< 85 C

E Mixed mode temperature > 85 C and < 94 C thermostat opens. Start of flow through radiator

F Cooling mode temperature > 94 C thermostat opened, full flow through radiator

M Engine

S Windshield washer fluid reservoir, coolant heated

Zh Heater booster < 5° C and > 70° C

P20.00-0398-06

Diagram of coolant circuit engine 602.983

1 Coolant expansion reservoir

2 Radiator

3 Thermostat

4 Coolant pump

5 Heating valve

6 Electric valve

7 Overflow hose

8 Heating system heat exchanger

9 Electric pump

10 Fuel heat exchanger

A Coolant return flow

B Coolant feed

C Vent

D Bypass mode temperature
< 85 C

E Mixed mode temperature >85° C and < 94° C

F Cooling mode temperature > 94° C

M Engine

ZH Stationary heater

P20.00-0236-06

Diagram of coolant circuit engine 605 with oil-water heat exchanger at oil pan

1 Coolant expansion reservoir with silica gel tank (1a)

2 Radiator

3 Coolant thermostat (position engine at normal operating temperature)

4 Coolant pump

5 Oil-water heat exchanger at oil pan

6 Heating system heat exchanger

7 Vent line to coolant expansion reservoir

A31 Heating system delivery unit

A31y1 Left duovalve

A31y2 Right duovalve

A Coolant return flow

B Coolant feed

D Bypass mode temperature
< 85 C

E Mixed mode temperature > 85 C and < 94 C thermostat opens. Start of flow through radiator

F Cooling mode temperature > 94 C thermostat opened, full flow through radiator

M Engine

S Windshield washer fluid reservoir, coolant heated

P20.00-0237-06

Diagram of coolant circuit engine 605 with oil-water heat exchanger at oil filter

1 Coolant expansion reservoir with silica gel tank (1a)

2 Radiator

3 Coolant thermostat (position engine at normal operating temperature)

4 Coolant pump

5 Oil filter with coolant heat exchanger

6 Heating system heat exchanger

7 Vent line to coolant expansion reservoir

8 Engine 605.960: Overflow tank (is replaced as phased-in measure by 2-stage cap at expansion reservoir

A31 Heating system delivery unit

A31y1 Left duovalve

A31y2 Right duovalve

A Coolant return flow

B Coolant feed

C Vent line to coolant expansion reservoir

D Bypass mode temperature < 80 C

E Mixed mode temperature > 80 C and < 94 C thermostat opens. Start of flow through radiator

F Cooling mode temperature > 94 C thermostat opened, full flow through radiator

M Engine

S Windshield washer fluid reservoir, coolant heated

a From crankcase

b To cylinder head

P20.00-0232-06

Diagram of coolant circuit engine 606.912 in model 210 with oil-water heat exchanger at oil filter

1 2-stage expansion reservoir cap

2 Coolant expansion reservoir with silica gel tank

3 Radiator

4 Coolant thermostat (position engine at normal operating temperature)

5 Coolant pump

6 Oil filter with coolant heat exchanger

8 Heating system heat exchanger

A31 Heating system delivery unit

A31y1 Left duovalve

A31y2 Right duovalve

A Coolant return flow

B Coolant feed

C Vent line to coolant expansion reservoir

D Bypass mode temperature
< 85 C

E Mixed mode temperature > 85 C and < 94 C thermostat opens. Start of flow through radiator

F Cooling mode temperature > 94 C thermostat opened, full flow through radiator

M Engine

S Windshield washer fluid reservoir, coolant heated

a From crankcase

b To cylinder head

P20.00-0275-06

Diagram of coolant circuit engine 606.961 in model 140 with engine oil cooler in wheelhousing

1 Coolant expansion reservoir with silica gel tank (1a)

2 Radiator

3 Coolant thermostat (position engine at normal operating temperature)

4 Coolant pump

6 Heating system heat exchanger

7 Vent line to coolant expansion reservoir

8 Expansion reservoir

A31 Heating system delivery unit

A31y1 Left duovalve

A31y2 Right duovalve

A Coolant return flow

B Coolant feed

C Vent line to coolant expansion reservoir

D Bypass mode temperature < 80° C

E Mixed mode temperature > 80° C and < 94° C thermostat opens. Start of flow through radiator

F Cooling mode temperature > 94 °C thermostat opened, full flow through radiator

G Heating mode off, valves pressurized (vehicle parked, engine off cooling)

H Heating mode, valves not pressurized

K Bypass

M Engine

R Return flow of heating system delivery unit (A31)

S Windshield washer fluid reservoir, coolant heated

R Feed of heating system delivery unit (A31)

P20.00-0312-57

Diagram of coolant circuit engine 606.962 in model 210 with engine oil cooler in wheelhousing

1 2-stage expansion reservoir cap

2 Coolant expansion reservoir with silica gel tank

3 Radiator

4 Coolant thermostat (position engine at normal operating temperature)

5 Coolant pump

8 Heating system heat exchanger

A31 Heating system delivery unit

A31y1 Left duovalve

A31y2 Right duovalve

A Coolant return flow

B Coolant feed

C Vent line to coolant expansion reservoir

D Bypass mode temperature < 85 C flow possible into passenger compartment

E Mixed mode temperature > 85 C and < 94 C thermostat opens.

Start of flow through radiator

F Cooling mode temperature > 94 C thermostat opened, full flow through radiator

M Engine

S Windshield washer fluid reservoir, coolant heated