BMW 3: Installation locations and connections
BMW 3 Series G20 (2018-2026) Training manual / Electrical Heating / Installation locations and connections
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G20 PHEV, heater circuit
- Electric coolant pump
- Connection to the coolant circuit
- Heat exchanger for heating system
- Electrical heating
- Electrical changeover valve
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Connections at the electric heating
- Coolant feed line (from the electric coolant pump)
- Coolant feed line (to the heat exchanger for heating system)
- Coolant temperature sensor
- Equipotential bonding line connection
- Signal connector (low-voltage connector)
- Coolant temperature sensor connection
- High-voltage connector connection
- Housing
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Operating principle
If the driver adjusts a desired temperature at the IHKA controls, the IHKA
calculates a corresponding
nominal temperature and compares it to the actual output temperature of the
electrical heating.
Low coolant temperature
When the coolant temperature is low, for example after driving off, or in
all-electric driving, the electric
changeover valve is activated by the Body Domain Controller (BDC). The
electrical changeo
Antifreeze and corrosion inhibitor
The cooling system of the G20 PHEV is filled with the new antifreeze and
corrosion inhibitor Frostox
HT-12. The new antifreeze and corrosion inhibitor increases the long-term
stability and corrosion
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Cooling
To guarantee the thermal operating safety of the electrical machine in every
situation, it is cooled with
coolant in the G20 PHEV. For this, the electrical machine is integrated in the
coolant circuit of the
transmission.
To cool the stator coils, the transmission oil is directed through a c
High-voltage cables
The high-voltage cables connect the high-voltage components and are
identified by orange cable
sleeves. The manufacturers of hybrid cars have agreed on a uniform
identification of the high-voltage
cable with the orange warning color. An overview of the high-voltage cables used
in the G20 PHE
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