Engine Coolant - GMC Duramax Diesel 2015 Owner's Manual

10-18 Vehicle Care
Van Models
1. Coolant Surge Tank
2. Coolant Surge Tank
Pressure Cap
3. Engine Cooling Fan (Out
of View)
Warning
Heater and radiator hoses, and
other engine parts, can be very
hot. Do not touch them. If you do,
you can be burned.
Warning (Continued)
Do not run the engine if there is a
leak. If you run the engine, it
could lose all coolant. That could
cause an engine fire, and you
could be burned. Get any leak
fixed before you drive the vehicle.
Using coolant other than
DEX-COOL
premature engine, heater core,
or radiator corrosion. In addition,
the engine coolant could require
changing sooner. Any repairs
would not be covered by the
vehicle warranty. Always use
DEX-COOL (silicate-free) coolant
in the vehicle.
(Continued)
Caution
®
can cause

Engine Coolant

The cooling system in the vehicle is
®
filled with DEX-COOL
coolant. This coolant is designed to
remain in the vehicle for 5 years or
240 000 km (150,000 mi), whichever
occurs first, if you add only
DEX-COOL extended life coolant.
The following explains the cooling
system and how to add coolant
when it is low. If there is a problem
with engine overheating, see Engine
Overheating on page 10-22.
A 50/50 mixture of clean, drinkable
water and DEX-COOL coolant will:
Give freezing protection down to
37°C ( 34°F).
Give boiling protection up to
129°C (265°F).
Protect against rust and
corrosion.
Help keep the proper engine
temperature.
Let the warning lights and
gauges work as they should.
engine