GMC 2009 Sierra - Manual (Page 335)

Consistency of Readings
Always check the fluid level at least twice using the
procedures described. Consistency (repeatable readings)
is important to maintaining proper fluid level. If fluid is
added, it may take 15 minutes or longer to obtain an
accurate reading because of residual fluid draining
down the dipstick tube. If inconsistent readings persist,
check the transmission breather to be sure it is clean
and not clogged. If readings are still inconsistent,
contact your dealer/retailer.
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 five 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 5-26.
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 the first maintenance
service after each 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.
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