2002 GMC SIERRA Owner's Manual

Page 297 of 394

GMC SIERRA 2002  Owners Manual 6-20
Automatic Transmission Fluid
When to Check and Change
A good time to check your automatic transmission fluid
level is when the engine oil is changed.
Change both the fluid and filter every 50,000

Page 298 of 394

GMC SIERRA 2002  Owners Manual 6-21
To get the right reading, the fluid should be at normal
operating temperature, which is 180F to 200F 
(82C to 93C).
Get the vehicle warmed up by driving about 15 miles
(24 km) when outside te

Page 299 of 394

GMC SIERRA 2002  Owners Manual 6-22
Then, without shutting off the engine, follow 
these steps:
The red transmission dipstick handle with this symbol is
located at the rear of the engine compartment, on the
passengers side. See ª

Page 300 of 394

GMC SIERRA 2002  Owners Manual 6-23 How to Add Fluid
Refer to the Maintenance Schedule to determine what
kind of transmission fluid to use. See ªRecommended
Fluids and Lubricantsº in the Index.
Add fluid only after checking the t

Page 301 of 394

GMC SIERRA 2002  Owners Manual 6-24 How to Check Lubricant
To get an accurate reading, the vehicle should be on a
level surface.
The proper level is from 5/8 inch to 1 5/8 inch (15 mm
to 40 mm) below the bottom of the filler plug h

Page 302 of 394

GMC SIERRA 2002  Owners Manual 6-25
How to Check Lubricant
Automatic Transfer Case (A) Fill Plug 
(B) Drain Plug
To get an accurate reading, the vehicle should be on a
level surface.
If the level is below the bottom of the filler p

Page 303 of 394

GMC SIERRA 2002  Owners Manual 6-26
How to Check LubricantTo get an accurate reading, the vehicle should be on a
level surface.
If the level is below the bottom of the filler plug hole,
you may need to add some lubricant.
When the

Page 304 of 394

GMC SIERRA 2002  Owners Manual 6-27
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