Engine Overheating - Cadillac STS 2011 Owner's Manual

4. With the coolant surge tank pressure cap off, start
the engine and let it run until you can feel the
upper radiator hose getting hot. The upper radiator
hose is the largest of the hoses which comes out
of the radiator, on the passenger side of the
vehicle. Watch out for the engine cooling fans.
By this time, the coolant level inside the coolant
surge tank may be lower. If the level is lower, add
more of the proper mixture to the coolant surge
tank until the level reaches the FULL COLD/FROID
line on the side of the coolant surge tank.
5. Then replace the pressure cap. Be sure the
pressure cap is hand-tight and fully seated.
Start the engine and allow it to warm up.

Engine Overheating

The vehicle has several indicators to warn of engine
overheating.
There are two engine hot messages that could be
displayed in the Driver Information Center (DIC). See
DIC Warnings and Messages on page 4 76 DIC
Warnings and Messages for more information.
6-30
If the engine is overheating, then you will find a coolant
temperature gauge and a coolant warning light on the
instrument panel. See Engine Coolant Temperature
Gauge on page 4 61 and Engine Coolant Temperature
Warning Light on page 4 61 for more information.
You may decide not to lift the hood when this warning
appears, but instead get service help right away. See
Roadside Service on page 8 8.
If you do decide to lift the hood , make sure the vehicle
is parked on a level surface.
Then check to see if the engine cooling fans are
running. If the engine is overheating, both fans should
be running. If they are not, do not continue to run the
engine and have the vehicle serviced.
Notice: Engine damage from running your engine
without coolant is not covered by the vehicle
warranty. See Overheated Engine Protection
Operating Mode for information on driving to a safe
place in an emergency.
Notice: If the engine catches fire while driving with
no coolant, the vehicle can be badly damaged. The
costly repairs would not be covered by the vehicle
warranty. See Overheated Engine Protection
Operating Mode on page 6 32 for information on
driving to a safe place in an emergency.