Cooling System - GMC Hummer EV 2024 Owner's Manual

GMC Hummer EV Owner Manual (GMNA-Localizing-MidEast-16639039) -
2024 - CRC - 3/20/23
282 Vehicle Care
1. Battery (Under Cover). See Battery 0 285.
2. Underhood Compartment Fuse Block
(Under Cover). Underhood Compartment
Fuse Block 0 292.
3. Coolant Surge Tank and Pressure Cap
(Under Cover). See Cooling System 0 282.
4. Brake Fluid Reservoir (Under Cover). See
Brake Fluid 0 284.
5. Windshield Washer Fluid Reservoir. See
Washer Fluid 0 283.

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 system
and how to check coolant level.
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.
Checking Coolant
The coolant needs to be replaced at the
appropriate interval. See Maintenance
Schedule 0 344.
The coolant reservoir is in the underhood
compartment. See Underhood Compartment
Overview 0 281.
To access the coolant reservoir under the
hood, the right side access cover needs to
be removed.
1. Park on a level surface and turn the
vehicle off.
2. Open the hood. See Hood 0 278.
3. Turn the three bolts three quarter turn
and remove the right side access cover.