GMC 1999 Sonoma, Owner'S Manual

Page: 258 / 384

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How to Add Fluid
Refer to the Maintenance Schedule to determine what
kind of transmission fluid to use. See “Recommended
Fluids and Lubricants” in the Index.
Add fluid only after checking the transmission fluid while it
is hot. (A cold check is used only as a reference.) If the fluid
level is low, add only enough of the proper fluid to bring the
level up to the HOT area for a hot check. It doesn’t take much
fluid, generally less than one pint (0.5 L). Don’t overfill.
NOTICE:
We recommend you use only fluid labeled
DEXRON
R
-
III, because fluid with that label is
made especially for your automatic transmission.
Damage caused by fluid other than
DEXRON
R
-
III is not covered by your new
vehicle warranty.
D After adding fluid, recheck the fluid level as
described under “How to Check.”
D When the correct fluid level is obtained, push the
dipstick back in all the way; then flip the handle
down to lock the dipstick in place.
Manual Transmission Fluid
When to Check
A good time to have it checked is when the engine oil is
changed. However, the fluid in your manual
transmission doesn’t require changing.
How to Check
Because this operation can be a little difficult, you
may choose to have this done at your GM dealership
Service Department.
If you do it yourself, be sure to follow all the
instructions here, or you could get a false reading.
NOTICE:
Too much or too little fluid can damage your
transmission. Too much can mean that some of
the fluid could come out and fall on hot engine
parts or exhaust system parts, starting a fire. Be
sure to get an accurate reading if you check your
transmission fluid.