Cooling System - GMC 2009 Yukon XL Owner's Manual

Consistency of Readings
Always check the fluid level at least twice using the
procedure described previously. Consistency
(repeatable readings) is important to maintaining
proper fluid level. If readings are still inconsistent,
contact your dealer/retailer.

Cooling System

If the vehicle is a Two-mode Hybrid, see the Two-mode
Hybrid manual for more information.
The cooling system allows the engine to maintain the
correct working temperature.
5-28
5.3L Engine shown, 4.8L, 6.0L and
6.2L Engine similar
A. Coolant Surge Tank
B. Coolant Surge Tank Pressure Cap
C. Engine Cooling Fan(s)