Engine Coolant; When adding coolant, it is important that you use; If coolant other than DEX- Page 253

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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, a GM thermostat i
s recommended.

Engine Coolant

The cooling system in your vehicle is filled with
DEX

-

COOL

R

 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

R

 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” in 
the Index.

A 50/50 mixture of clean, drinkable water and
DEX

-

COOL

R

 coolant will:

D

Give freezing protection down to 

-

34

_

F (

-

37

_

C).

D

Give boiling protection up to 265

_

F (129

_

C).

D

Protect against rust and corrosion.

D

Help keep the proper engine temperature.

D

Let the warning lights and gages work as 
they should.

NOTICE:

When adding coolant, it is important that you use
only DEX

-

COOL

R

 (silicate

-

free) coolant.

If coolant other than DEX

-

COOL is added to the

system, premature engine, heater core or
radiator corrosion may result. In addition, the
engine coolant will require change sooner 

--

 at

30,000 miles (50 000 km) or 24 months,
whichever occurs first. Damage caused by the use
of coolant other than DEX

-

COOL

R

 is not

covered by your new vehicle warranty.