Cadillac 2006 XLR Owner's Manual page 180

HOT ENGINE–A/C OFF: This message displays when
the engine coolant becomes hotter than the normal
operating temperature. To avoid added strain on a hot
engine, the air conditioning compressor is automatically
turned off. When the coolant temperature returns to
normal, the A/C operation will automatically resume.
You can continue to drive your vehicle. If this message
continues to appear, have the system repaired by
your GM dealer as soon as possible to avoid
compressor damage.
ICE POSSIBLE: This message appears when the
outside air temperature is cold enough to create icy road
conditions.
LEFT DOOR AJAR: This message will display anytime
the vehicle engine is running, the transmission is not
in PARK (P) and the driver's door is open or ajar.
A chime will sound when the vehicle's speed is greater
than 3 mph (4.8 km/h).
LOW BRAKE FLUID: This message will display if the
vehicle is running to inform the driver that the brake
fluid level is low. Have the brake system serviced
by your GM dealer as soon as possible. See "Brake
Fluid" under Brakes on page 6-33.
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LOW COOLANT: This message will appear when there
is a low level of engine coolant. Have the cooling
system serviced by your GM dealer as soon as possible.
See Engine Coolant on page 6-20.
LOW FUEL: This message will appear when the fuel
supply is less than 5 gallons (18.9 L) and the display is
turned off. A single chime will also sound when this
message is displayed.
LOW OIL LEVEL: For correct operation of the low oil
sensing system, your vehicle should be on a level
surface. A false LOW OIL LEVEL message may appear
if the vehicle is parked on a grade. The oil level
sensing system does not check for actual oil level if the
engine has been off for a short period of time, and
the oil level is never checked while the engine is
running. If the LOW OIL LEVEL message appears, and
your vehicle has been parked on level ground with
the engine off for at least 30 minutes, the oil level should
be checked by observing the oil dipstick. Prior to
checking the oil level, be sure the engine has been off
for a few minutes and your vehicle is on a level
surface. Then check the dipstick and add oil if
necessary. See Engine Oil on page 6-13.