GMC T-Series 1999, Owner'S Manual, Page: 213 / 344

yellow blue
6-27
The air cleaner is located behind the cab on the
passenger’s side.
1. To access the filter element, remove all three finger
screws and carefully remove the cover.
2. The element can then be removed.
3. Be sure that all three finger screws are tightened
securely when replacing the element and
housing cover.
Air Conditioner Filter
Your maintenance schedule says when to clean the air
conditioner filter. The air conditioner filter is located
behind the front panel.
1. To clean the filter, open the panel and remove the
three filters.
2. Using compressed air, blow off any dust on
the filters.
3. The filters may also be washed with water and
dried completely.
Automatic Transmission Fluid
When to Check
A good time to have it checked is when the engine oil is
checked. See your Allison Automatic Transmission
Operator’s Manual to find out when to change your
transmission fluid and filters.
How to Check and What to Use
The Allison Automatic Transmission Operator’s Manual
that came with the vehicle shows how to check the
automatic transmission fluid and what fluid to use.
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.