Coolant Surge Tank Pressure Cap; Engine Overheating - Chevrolet 2004 Tahoe Owner's Manual

Coolant Surge Tank Pressure Cap

The coolant surge tank pressure cap must be fully
installed on the coolant surge tank.
Notice: If the pressure cap is not tightly installed,
coolant loss and possible engine damage may
occur. Be sure the cap is properly and tightly
secured.
See Engine Compartment
Overview on page 5-12
for more information
on location.

Engine Overheating

You will find a coolant temperature gage on your vehicle's
instrument panel. See Engine Coolant Temperature
Gage on page 3-47. In addition, you will find an ENGINE
OVERHEATED, and a REDUCED ENGINE POWER
message in the DIC on the instrument panel. See Driver
Information Center (DIC) on page 3-56.
Overheated Engine Protection
Operating Mode (V8 Engines Only)
If an overheated engine condition exists and the
REDUCED ENGINE POWER message is displayed,
an overheat protection mode which alternates firing
groups of cylinders helps prevent engine damage.
In this mode, you will notice a loss in power and engine
performance. This operating mode allows your vehicle
to be driven to a safe place in an emergency. Driving
extended miles (km) and/or towing a trailer in the
overheat protection mode should be avoided.
Notice: After driving in the overheated engine
protection operating mode, to avoid engine damage,
allow the engine to cool before attempting any repair.
The engine oil will be severely degraded. Repair the
cause of coolant loss, change the oil and reset the
oil life system. See Engine Oil on page 5-16.
5-29