Coolant circuit, basic function

GF20.00-P-1003A

Coolant circuit, basic function

23.06.2020

Engine

all (CAR)

Example schematic diagram of coolant circuit

1	Turbocharger
2	Exhaust gas aftertreatment metering valve
3	Coolant circulation pump
4	Charge air cooler
5	Heating system heat exchanger
6	Exhaust gas recirculation cooler (low-pressure EGR)
7	Crankcase
8	Transmission oil heat exchanger
9	Engine oil heat exchanger
10	Exhaust gas recirculation cooler (high-pressure EGR)
11	Charge air cooler
12	Transmission cooling low-temperature cooler
13	Engine radiator
14	Coolant circulation pump for transmission and charge air cooling low-temperature circuit
15	Coolant expansion reservoir
16	Engine cooling circuit coolant pump
17	Coolant temperature sensor
18	Coolant thermostat
A	Coolant cold (engine cooling circuit)
B	Coolant warm (engine cooling circuit)
C	Transmission cooling low-temperature circuit
D	Ventilation

P20.00-2667-76

Overview

This document contains information on:

 General

 Function

General

The engine cooling system comprises multiple cooling circuits depending on the components. The cooling circuits are closed systems which use coolant to transfer heat to the surroundings.

Function

The engine cooling system is generally made up of the following cooling circuits:

 Heating circuit

 Engine cooling circuit

 Low-temperature circuit

The engine cooling circuit generally consists of the following components:

 Engine cooling circuit coolant pump

 Engine oil heat exchanger

 Coolant thermostat

 Engine radiator

 Coolant expansion reservoir

 Heating system heat exchanger

 Coolant temperature sensor

Depending on the drivetrain and equipment, further components, such as an exhaust gas turbocharger or exhaust gas recirculation cooler, may also be integrated in the engine cooling circuit.

The low-temperature circuits may include the following components:

 Low-pressure cooler

 Coolant circulation pump

 Transmission oil heat exchanger

 Charge air cooler

 Switchover valve

 Coolant temperature sensor

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