Cadillac XT4 2023 Owner's Manual page 268

2. Keep turning the pressure cap slowly and
remove it.
3. If topping up the level in the coolant
surge tank, add the proper mixture until
the level reaches the mark on the front
of the tank and replace the cap. Operate
the vehicle. Repeat steps 1 3, as
necessary.
If filling the system (such as after
servicing), follow the Automatic Coolant
Service Filling Instructions.
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 Filling
Instructions
It is recommended to take Diesel engine
vehicles to the retailer for coolant system
servicing. However, if that is not possible,
the vehicle is equipped with an Automatic
Coolant Service Fill feature.
To fill the system, use the following steps:
1. With a cold system, add coolant to the
indicated mark on the surge tank.
2. Turn the ignition on. See Ignition
Positions 0 180.
3. Turn off the air conditioning.
4. Apply the parking brake.
5. At the same time, depress the
accelerator and the brake pedals for
two seconds, then release.
6. Start the vehicle within five to
10 seconds.
Vehicle Care
7. Idle for three minutes while adding fluid
as the level drops below the indicated
mark on the surge tank.
8. Reinstall the cap and run the engine at
2000 RPM for 10 minutes while watching
the coolant temperature gauge to be
sure the temperature has risen but is not
overheating.
If the temperature has not risen or the
temperature is indicating overheating,
stop the process by returning to idle and
turning off the engine. Then return to
Step 1. If the coolant filling process
cannot be completed without
overheating, see your retailer for
assistance.
If the temperature has risen and is not
overheating, proceed to Step 9.
9. Idle the engine for two minutes before
turning off and allowing the engine to
cool down.
10. Allow the system to completely cool
down and make a note of the level of
the coolant in the surge tank. If low, add
fluid to the indicated mark and repeat
Steps 3 9.
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