Chevrolet Spark EV 2014 Owner's Manual page 249

The TPIM, APM, and charger
module coolant should only be
serviced by a qualified technician.
Cabin heating uses a separate
coolant system.
When cabin heating is requested,
the heater and heater coolant pump
are turned on to circulate warm
coolant through the heater core.
The heater coolant reservoir in the
vehicle is filled with a 50/50 mixture
of DEX-COOL coolant and
deionized water. If using this
mixture, nothing else needs to be
added.
The coolant needs to be replaced
at the appropriate interval. See
.
The vehicle must be on a level
surface when checking the coolant
level.
The heater coolant reservoir is in
the underhood compartment. See
.
1. TPIM, APM, and Charger
Module Coolant Reservoir
2. Heater Coolant Reservoir
Check to see if coolant is visible
in the heater coolant reservoir.
If coolant is visible but the coolant
level is below the cold fill line, there
could be a leak in the system.
The heater coolant should only be
serviced by a qualified technician.
When windshield washer fluid is
needed, be sure to read the
manufacturer's instructions before
use. If operating the vehicle in an
area where the temperature may fall
below freezing, use a fluid that has
sufficient protection against
freezing.