Engine Coolant - GMC YUKON DENALI 1999 Owner's Manual

NOTICE:
Your radiator cap is a 15 psi (105 kPa) pressure
cap and must be tightly installed to prevent coolant
loss and possible engine damage from overheating.
Be sure the arrows on the cap line up with the
overflow tube on the radiator filler neck.
Thermostat
Engine coolant temperature is controlled by a thermostat
in the engine coolant system. The thermostat stops the
flow of coolant through the radiator until the coolant
reaches a preset temperature.
When you replace your thermostat, an ACDelco
thermostat is recommended.

Engine Coolant

The cooling system in your vehicle is filled with
-
DEX COOL
-
type
to remain in your vehicle for 5 years or 150,000 miles
(240 000 km), whichever occurs first, if you add only
-
DEX COOL
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" in
the Index.
R
R
engine coolant. This coolant is designed
R
extended life coolant.
yellowblue
6-23