Engine Coolant
The cooling system in your vehicle is filled with
DEX-COOL
®
engine coolant. This coolant is designed
to remain in your vehicle for 5 years or 150,000 miles
(240 000 km), whichever occurs first, if you add only
DEX-COOL
®
extended life coolant.
The following explains your cooling system and how to
add coolant when it is low. If you have a problem
with engine overheating, see
Engine Overheating on
page 5-29.
A 50/50 mixture of clean, drinkable water and
DEX-COOL
®
coolant will:
•
Give freezing protection down to
−
34°F (
−
37°C).
•
Give boiling protection up to 265°F (129°C).
•
Protect against rust and corrosion.
•
Help keep the proper engine temperature.
•
Let the warning lights and gages work as they
should.
Notice: Using coolant other than DEX-COOL
®
may
cause premature engine, heater core or radiator
corrosion. In addition, the engine coolant may
require changing sooner, at 30,000 miles (50 000 km)
or 24 months, whichever occurs first. Any repairs
would not be covered by your warranty. Always use
DEX-COOL
®
(silicate-free) coolant in your vehicle.
What to Use
Use a mixture of one-half
clean, drinkable water and
one-half DEX-COOL
®
coolant which won’t damage
aluminum parts. If you use this coolant mixture,
you don’t need to add anything else.
5-26
Summary of Contents for 2003 Yukon XL
Page 5: ...These are some examples of vehicle symbols you may find on your vehicle v ...
Page 6: ...Model Reference This manual covers these models Yukon Yukon XL vi ...
Page 64: ...Tahoe Yukon Second Row Seat Third Row 50 50 Split Bench Seat 1 58 ...
Page 94: ... NOTES 1 88 ...
Page 157: ... NOTES 3 3 ...
Page 158: ...Instrument Panel Overview 3 4 ...
Page 282: ... NOTES 3 128 ...
Page 372: ...When you open the hood on the VORTEC 8100 V8 engine you ll see the following 5 14 ...
Page 460: ...See Engine Compartment Overview on page 5 12 for more information on its location 5 102 ...
Page 488: ...Maintenance Record cont d Date Odometer Reading Serviced By Maintenance Record 6 20 ...
Page 500: ... NOTES 7 12 ...