Cadillac 2011 STS Owner's Manual page 266

This message displays when the engine coolant
temperature is too hot. Stop and allow the vehicle to
idle until it cools down. See Engine Coolant
Temperature Warning Light on page 4 61.
See Overheated Engine Protection Operating Mode on
page 6 32 for information on driving to a safe place in
an emergency.
4-80
This symbol appears
with this message.
This message displays when the engine coolant
becomes hotter than the normal operating temperature.
See Engine Coolant Temperature Gauge on
page 4 61. To avoid added strain on a hot engine, the
air conditioning compressor is automatically turned off.
When the coolant temperature returns to normal, the air
conditioning compressor turns back on. You can
continue to drive your vehicle.
If this message continues to appear, have the system
repaired by your dealer as soon as possible to avoid
damage to the engine.
This message displays when the engine power is
being reduced to protect the engine from damage.
There could be several malfunctions that might cause
this message. Reduced engine power can affect the
vehicle's ability to accelerate. If this message is on, but
there is no reduction in performance, proceed to your
destination. The performance may be reduced the
next time the vehicle is driven. The vehicle may be
driven at a reduced speed while this message is on, but
acceleration and speed may be reduced. Anytime this
message stays on, take the vehicle to your dealer for
service as soon as possible.