BMW 3: Installation locations and connections
BMW 3 Series G20 (2018-2025) 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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Fuel high-pressure pump
The single-piston high pressure pump by Bosch, well-known from the B46
engine, is used. The high
pressure pump HDP6 is driven by a triple cam which is attached to the exhaust
camshaft. To be able
to accommodate a fuel system pressure of 350 bar (5076 psi), the pump piston and
tappet have bee
Labels
Three signs are attached to the housing of the high-voltage battery unit: 1
type plate and 2 warning
stickers. The type plate provides logistical information (e.g. part number) and
the key technical data
(e.g. nominal voltage). The warning stickers point to the lithium-ion technology
on the one h
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