Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-16500442) -
2023 - CRC - 5/4/22
Vehicle Care
391
2. Add coolant through the
surge tank until it is visible
through the air bleeder.
3. Replace the cooling
system air bleeder cap.
4. Add coolant to the
indicated line on the
surge tank.
5. Replace the pressure cap
on the surge tank.
6. Activate the service
feature:
6.1. Connect the vehicle to
a battery charger.
6.2.Turn the ignition to
Service Mode. See
Ignition Positions
6.3.Turn off the air
conditioning.
6.4.Set the parking brake.
6.5.At the same time, press
the accelerator and the
brake pedal for
two seconds, then
release.
6.6.At the end of the cycle,
check the coolant level
in the surge tank and
add coolant if it is
below the indicated
line. Turn the ignition
off, carefully remove
the pressure cap, refill
to the indicated line,
replace the pressure
cap, and repeat steps
6.2
–
6.6.
Listen for pump activation and
movement of the control
valves while watching the level
of the coolant in the surge
tank. If the tank empties, turn
the ignition off, carefully
remove the pressure cap, refill
to the indicated line, replace
the pressure cap, and repeat
steps 6.2
–
6.6.
The fill and air removal
process will run for
approximately 15 minutes.
Caution
If the pressure cap is not
tightly installed, coolant loss
and engine damage may
occur. Be sure the cap is
properly and tightly secured.
Engine Overheating
The vehicle has an indicator to
warn of the engine
overheating.
If the decision is made not to
lift the hood when this
warning appears, get service
help right away. See Roadside
Assistance Program
If the decision is made to lift
the hood, make sure the
vehicle is parked on a level
surface.
Then check to see if the
engine cooling fan is running.
If the engine is overheating,
the fan should be running. If it
is not, do not continue to run
the engine. Have the vehicle
serviced.