Cadillac XT6 Owner Manual (GMNA-Localizing-U.S./Canada-16405819) -
2023 - CRC - 3/22/22
380
Vehicle Care
coolant surge tank until
the level reaches the mark
pointed to on the front of
the coolant surge tank.
5. Replace the pressure cap
tightly.
6. Verify coolant level after
the engine is shut off and
the coolant is cold.
If necessary, repeat
coolant fill procedure
Step 1
–
6.
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.
Automatic Coolant
Service Fill Instructions
(2.0L Engine Only)
If equipped, this feature
assists in filling and removing
air from the cooling system
after service of components
or when coolant is added after
being too low.
To activate the fill and air
removal process:
1. With a cold system,
disconnect the vent line
from the port near the cap
on the surge tank. Add
coolant to the indicated
mark on the surge tank.
2. Reconnect the vent line to
the surge tank and replace
the cap on the surge tank.
3. Connect the vehicle to a
battery charger.
4. Put the vehicle in Service
Mode. See Ignition
Positions
5. Turn off the air
conditioning.
6. Set the parking brake.
7. At the same time, press
the accelerator and the
brake for automatic
transmission vehicles for
two seconds, then release.
At the end of the cycle, check
the coolant level in the surge
tank and add coolant, if it is
low. Turn off the vehicle, allow
the Engine Control Module
(ECM) to go to sleep, about
two minutes, and repeat
steps 3-7.
Listen for pump activation and
movement of the control
valves while watching the level
of the tank. If the tank
empties, turn the ignition off,
carefully remove the surge
tank cap, refill to the indicated
mark and repeat steps 3-6.
The fill and air removal
process will run for
approximately 10 minutes.