2021 CHEVROLET BOLT EV heater

Chevrolet Bolt EV Owner Manual (GMNA-Localizing-U.S./Canada-
14637856) - 2021 - CRC - 10/2/20
142 Climate Controls
Touching this button cancels automatic
recirculation. Press AUTO to return to
automatic operation; recirculation runs
automatically as needed.
vHEAT :Touch to turn the heater on when
the fan is on.
A/C : Touch to turn the air conditioning on
when the fan is on.
Auto Defog : The system will monitor high
humidity inside the vehicle. When high
humidity is detected, the climate control
system may adjust to outside air supply and
turn on the air conditioner or the heater.
The fan speed may slightly increase to help
prevent fogging. When high humidity is no
longer detected, the system will return to
its prior operation. To turn Auto Defog off
or on, see “Climate and Air Quality” under
Vehicle Personalization 0101.
Auto Heated Seats : If equipped, when the
vehicle is on, this feature will automatically
activate the heated seats at the level
required by the vehicle’s interior
temperature. In auto mode, the indicators
automatically show the level setting
required. Use the manual heated seat buttons on the
infotainment display to turn auto heated
seats off. Once this feature is turned off, the
auto heated seats will be activated the next
time the vehicle is turned on.
In manual mode, the controls can be
accessed while the vehicle is on by touching
(orMwith three level indicators high,
medium, low or off on the climate control
display. If the passenger seat is unoccupied,
the auto heated seats feature will not
activate that seat. See Heated Front Seats
0 29 and
Vehicle Personalization 0101.
Rear Window Defogger
K:Press to turn the rear window defogger
on or off. An indicator light on the button
comes on to show that the rear window
defogger is on.
The defogger only works when the vehicle is
on. The defogger will turn off if the vehicle
is turned off.
Caution
Do not try to clear frost or other material
from the inside of the front windshield
and rear window with a razor blade or
(Continued)
Caution (Continued)
anything else that is sharp. This may
damage the rear window defogger grid
and affect the radio's ability to pick up
stations clearly. The repairs would not be
covered by the vehicle warranty.
Remote Start : The climate control system
may be started by using the Remote Keyless
Entry (RKE) transmitter. The climate control
system will default to an appropriate
heating or cooling mode. See Remote Start
0 13.
The rear window defogger turns on if it is
cold outside.
Mobile Application Feature
If equipped, this feature allows a
smartphone to set the start-up climate
control settings. The following features can
be set:
.Temperature
.Fan Speed
.Air Delivery Mode
.Climate Mode
.Recirculation

Chevrolet Bolt EV Owner Manual (GMNA-Localizing-U.S./Canada-
14637856) - 2021 - CRC - 10/2/20
Vehicle Care 201
1. Windshield Washer Fluid Reservoir. SeeWasher Fluid 0202.
2. Cabin Heating Coolant Reservoir. See Cooling System 0201.
3. High Voltage Battery Coolant Reservoir. See Cooling System 0201.
4. HPDM (High Power Distribution Module).
5. APM (Accessory Power Module), OBCM (On-Board Charging Module).
6. Brake Fluid Reservoir. See Brake Fluid
0 203.
7. SPIM, APM, and Charger Module Coolant Reservoir. See Cooling System 0201.
8. Battery. See Battery - North America
0 204.
9. Underhood Compartment Fuse Block. Underhood Compartment Fuse Block
0211.
Cooling System
It is not necessary to regularly check coolant
unless a leak is suspected or an unusual
noise is heard. A coolant loss could indicate
a problem. Have it inspected and repaired
by your dealer.
The following explains the cooling systems
and how to check coolant levels.
.High Voltage Battery
.Single Power Inverter Module (SPIM),
Accessory Power Module (APM), and
Charger Module
.Cabin Heating
High Voltage Battery
During vehicle operation and also during
charging, the high voltage battery cells in
the vehicle are kept within a normal
operating temperature range. If the
temperature rises above this temperature,
the battery cooling system turns on the air
conditioning compressor and cools the
coolant until the correct temperature is
reached. If the temperature falls below this
temperature, a high voltage heater, located
outside the battery on a cradle, heats the
coolant until the correct temperature is
reached.
Single Power Inverter Module (SPIM),
Accessory Power Module (APM), and
Charger Module
The SPIM, APM, and charger module are
cooled using a separate coolant loop. These
modules are kept below a maximum
temperature. If the temperature rises above
this temperature, the electric cooling fan will
turn on to cool the coolant.
Cabin Heating
Cabin heating is maintained by coolant
heated by the Coolant Heater Control
Module (CHCM), separate from the power
electronics and battery coolant loops. This
module heats the coolant based on
temperature inputs from the cabin climate
control systems.
Hybrid Cooling System Pressure Caps
The hybrid cooling system reservoirs have
tamper resistant pressure caps. The coolant
should only be serviced by a qualified
technician.
Checking Coolant
The coolant needs to be replaced at the
appropriate interval. See Maintenance
Schedule 0253.
The coolant reservoirs are in the underhood
compartment. See Underhood Compartment
Overview 0200.

Chevrolet Bolt EV Owner Manual (GMNA-Localizing-U.S./Canada-
14637856) - 2021 - CRC - 10/2/20
214 Vehicle Care
FusesUsage
51 Electric brake boost
52 –
54 A/C control module
55 Rechargeable energy
storage system
coolant pump
56 –
57 Power electronics
coolant pump
58 Engine control module
59 –
60 HVAC electric heater 61 On-board charging module
62 Transmission range control
module 1
63 Electric cooling fan
64 Engine control module 65 Auxiliary heater pump
66 Powertrain 67 Drive unit controller
70 A/C control module Fuses
Usage
71 –
72 Transmission range control
module
73 Single power inverter
module
74 –
Relays Usage
6 Pedestrian friendly alert
function
21 HID lamp
25 Powertrain
53 Run/Crank
68 Rear window defogger
69 Second run/CrankInstrument Panel Fuse Block

Chevrolet Bolt EV Owner Manual (GMNA-Localizing-U.S./Canada-
14637856) - 2021 - CRC - 10/2/20
262 Technical Data
Vehicle Data
Capacities and Specifications
The following approximate capacities are given in metric and English conversions.
Refer toRecommended Fluids and Lubricants 0258 for more information.
Application Capacities Metric English
Air Conditioning Refrigerant For the air conditioning system refrigerant charge type and
amount, see the refrigerant label under the hood. See your dealer for more information.
Cooling Systems*
IHigh Voltage Battery 7.0 L 7.4 qt
IPower Electronics 3.8 L 4.0 qt
IHeater 2.0 L
2.1 qt
Wheel Nut Torque 140Y 100 lb ft
All capacities are approximate. When adding, be sure to fill to the approximate level, as recommended in this manual. Recheck fluid level
after filling.
*Cooling systems capacity values are based on the individual cooling system and its components.