Overheated Engine Protection Operating; Mode (V8 Engines Only); Cooling System - Chevrolet 2007 Silverado 1500 Pickup Owner's Manual

If you still have the warning, turn off the engine
and get everyone out of the vehicle until it
cools down. Also, see "Overheated Engine
Protection Operating Mode" later in this section.
You may decide not to lift the hood but to get
service help right away.
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.
504
Repair the cause of coolant loss, change the
oil and reset the oil life system. See Engine Oil
(Gasoline Engine) on page 482.

Cooling System

When you decide it is safe to lift the hood, here is
what you will see:
8.1L V8 Engines
A. Coolant Surge Tank
B. Coolant Surge Tank Pressure Cap
C. Engine Cooling Fan