GMC 2007 Yukon XL Owner's Manual page 256

ENGINE HOT A/C (Air Conditioning)
TURNED OFF
This message will display when the engine coolant
becomes hotter than the normal operating
temperature. See Engine Coolant Temperature
Gage on page 234. To avoid added strain on a
hot engine, the air conditioning compressor
automatically turns off. When the coolant
temperature returns to normal, the air conditioning
compressor will turn back on. 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 damage to your engine.
ENGINE OIL LOW ADD OIL
If your vehicle has an oil level sensor and the oil
level in the vehicle is low, this message will
display. Check the oil level and correct it as
necessary. You may need to let the vehicle cool
or warm up and cycle the ignition to be sure
this message will clear.
This message will clear itself after 10 seconds,
until the next ignition cycle. See Engine Oil
on page 438 for additional information.
256
ENGINE OVERHEATED IDLE ENGINE
Notice: If you drive your vehicle while the
engine is overheating, severe engine damage
may occur. If an overheat warning appears
on the instrument panel cluster and/or
DIC, stop the vehicle as soon as possible.
See Engine Overheating on page 452 for more
information.
This message will display when the engine coolant
temperature is too hot. Stop and allow the
vehicle to idle until it cools down. See Engine
Coolant Temperature Gage on page 234.
See Overheated Engine Protection Operating
Mode on page 454 for information on driving to a
safe place in an emergency.